PLEASE NOTE:
*
CCNet 126/2001 - 29 November 2001
=================================
"Preliminary shooting star tallies and interviews with the
four
groups who predicted this year's Leonid meteor shower reveal that
while strides were made in the young science of meteor
forecasting,
nobody got it right in 2001. Nonetheless, experts say meteor
forecasting,
if not perfect, is at least coming of age. The other three
forecasts were
not entirely off base, and without question the 2001 version of
the
annual event was a storm, as expected by all four research
groups."
--Rob Britt, Space.com, 27 November 2001
"A new study concluding that astronomers have overstated the
risk of
an Earth-asteroid wreck is taking a pounding of its own in an
Internet
parody. In the November Astronomical Journal, Princeton
astronomer Zeljko
Ivezic used the latest images of the asteroid belt to calculate
that the
chance of an asteroid (sic) hitting Earth is 1 in 5000 every
century. That
is one-third lower than previous guesses, prompting Ivezic to
issue a widely
covered press release saying that earthlings should feel a lot
safer."
--Science, 23 November 2001, vol 294, p. 1649
(1) NEW STUDIES SHARPEN PICTURE OF NEAR-EARTH ASTEROIDS
Scientific American, 27 November 2001
(2) COMMUNICATING ASTRONOMY
Terry Mahoney <tjm@ll.iac.es>
(3) LEONID UPDATE
Rainer Arlt <rarlt@aip.de>
(4) LEONID METEOR SHOWER FORECASTS: 'IT LOOKS LIKE WE WERE ALL
WRONG'
Space.com, 27 November 2001
(5) LISTENING TO LEONIDS
NASA Science News, 26 November 2001
(6) ESA SCIENTISTS CAPTURE THE LION'S OFFSPRING DOWN UNDER
Andrew Yee <ayee@nova.astro.utoronto.ca>
(7) THE MAGI AND THE STAR
Biblical Archaeology Society, 2 December 2001
(8) MOON MINING WANT TO INVEST IN THE FINAL FRONTIER?
Yahoo! News, 24 November 2001
(9) ENVIRO-SCARE OF THE DAY: ANIMALS 'FACING CRISIS SIMILAR TO
THAT WHICH
KILLED DINOSAURS'
The Guardian, 29 November 2001
(10) SCARE ABOUT SPECIES EXTINCTION GREATLY EXAGGERATED
Julian L. Simon and Aaron Wildavsky
(11) EDGAR ALLAN POE & HISTORY
Hermann Burchard <burchar@mail.math.okstate.edu>
(12) BE OF GOOD CHEER
Andy Smith <astrosafe@yahoo.com>
(13) SCIENTIFIC RESPONSIBILITY AND PUBLIC PERCEPTION OF RISK
Michael Paine <mpaine@tpgi.com.au>
(14) AND FINALLY: INTERNET ASTEROID CLASH
Science, 23 November 2001, vol 294, p.
1649
===========
(1) NEW STUDIES SHARPEN PICTURE OF NEAR-EARTH ASTEROIDS
>From Scientific American, 27 November 2001
http://www.sciam.com/news/112601/1.html
A trio of new studies is helping to fill in astronomers' view of
how
asteroids near Earth orbit the sun and how they ended up there in
the first
place. The picture emerging is one in which asteroids in the belt
between
Mars and Jupiter collide, shatter and then clump together into
families,
migrate into regions of space where the gravity of Jupiter can
jar them
loose from their orbits and finally take up residence close to
Earth. "It's
pretty clear that [near-Earth asteroids] come from the main
asteroid belt
between Mars and Jupiter," explains Joseph Stuart of the
Massachusetts
Institute of Technology, an author of one of the reports. These
new studies,
all published in the current issue of the journal Science, are
"refining the
details of how that might happen."
Stuart, who compiled data from the Lincoln Near-Earth Asteroid
Research
(LINEAR) project, found more than 1,200 kilometer-size rocks
orbiting the
sun-more than recent counts have detected. Their orbits are also
more highly
angled relative to the plane that Earth sweeps out as it circles
the sun
than previous surveys had revealed. It's key for astronomers to
know how
many such objects there are and how they revolve around the sun
in order to
assess the risk that one might collide with Earth, he notes.
While the
greater angle between Earth's orbit and the asteroids' could
translate to a
lower collision risk, Stuart says he thinks the odds probably
won't deviate
much from earlier estimates. "There are a couple of
different factors that
pull in opposite directions and probably balance out," he
remarks.
To get at the origins of Earth's rocky neighbors, Patrick Michel
of the
Observatoire de la Cōte d'Azur in France and colleagues
simulated what would
happen if a large asteroid shattered. The researchers found that
such an
object would fragment into a range of smaller pieces but that
gravity would
pull the larger chunks back together, leaving one big asteroid
surrounded by
a family of smaller rocks. Until now, the authors write,
scientists had
assumed that collisions were responsible for asteroid families,
but they
didn't have a good grasp of the physics underlying these events.
Still, this violent formation doesn't account for all the
properties of
asteroid families, according to William Bottke of the Southwest
Research
Institute in Boulder and his co-workers. They point out that some
clusters
are nearly split into two separate groups composed of
different-sized pieces
and that some members sit on the cusp of resonances-areas where a
planet's
gravity periodically tugs the rocks as they orbit. Such orbits
can only last
a few million years, which is nothing compared with an asteroid's
billion-year age. The team's calculations indicate that after the
initial
collision, the asteroid fragments will enter a slow and steady
drift whose
speed depends on each piece's size. The rocks get a gentle push
from
sunlight they absorb and then emit back into space. Resonances
will capture
some of these family members and eject them from their orbit,
causing them
to eventually hit the sun or a planet, or leave the solar system
entirely.
Stuart says this result provides good evidence that such
drifting, rather
than the collision that generates a cluster, is responsible for
moving
asteroids into a resonance.-JR Minkel
Copyright 2001, Scientific American
==============
(2) COMMUNICATING ASTRONOMY
>From Terry Mahoney <tjm@ll.iac.es>
An International Conference to be held at
Museo de la ciencia y el cosmos
La Laguna, Tenerife (Spain)
25 February - 1 March, 2002
The advent of the new technologies and recent drives to increase
"productivity" on the part of the international
conglomerates that now own
the majority of publishing houses have led to drastic changes in
the way
scientific results are published. The pressures on publishers to
cut back on
in-house editorial services have led to more editorial
responsibilities
being placed on authors and conference proceedings editors. The
new
technologies, apart from offering potentially faster publication
have also
raised the possibility of bypassing the academic presses
altogether and
setting up electronic journals, with their supposed low costs and
greatly
shortened publication queues.
Astronomy is unique in its appeal to the popular imagination but
is becoming
ever more complex. This increasing complexity presents new
challenges to the
writers, broadcasters, and journalists whose job it is to explain
the often
difficult ideas involved in a way that will be grasped by a lay
audience,
and who must steer a course between dumbing down on the one hand
and what
may be called "dumbing up" to the professional
community on the other. Put
in other words, the popularizer's task is to avoid the extremes
of
trivialising the science and assuming too much scientific
background on the
part of the audience.
This meeting will examine how the scientific "signal"
is modified, or even
distorted, as it percolates from original research papers through
to the
different genres dedicated to the teaching, popularisation and
reporting of
astronomical results. One of the primary objectives of this
meeting is to
bring together the research and outreach communities so that
specialist
journal editors, popular writers, science broadcasters,
publishers,
journalists, etc., can exchange views and explain the techniques
and skills
they employ to communicate astronomy at all levels.
The meeting's website is at http://www.iac.es/proyect/commast/
===============
(3) LEONID UPDATE
>From Rainer Arlt <rarlt@aip.de>
-----------------------------------------------------------
International Meteor Organization
Meteor Shower Circular
2 0 0 1 L E O N I D S (UPDATE)
-----------------------------------------------------------
While utilizing all the incoming data for a global analysis of
the Leonid
meteor shower, an update on the activity graph may be of
interest. We find
two main peaks of activity: between November 18, 10h30m and
10h40m UT,
a maximum with ZHR~1400 was observed. Lyytinen et al. predicted
10h28m
and achieved best agreement. The second peak is located near
November 18,
18h20m UT which is very close to the predicted times of Lyytinen
et al.
(18h20m) and McNaught & Asher (18h13m). The Asian peak
is skew with a
longer anscending branch. This may indicate the presence of
activity from
the 9-revolution dust trail.
Compared with the first analysis by Krumov, the picture has
essentially
remained the same. Now, higher-resolution Leonid bins are
available from the
observers. The following 25 observers were included in the below
analysis:
Rastislav Bagin, Chu-lok Chan, Yeon-jong Choi, George W.
Gliba,
Lew Gramer, Pavol Habuda, Xiaolin Huang, Richard Huziak,
Martin
Krsek, Martin Lehky, Michael Linnolt, Robert Lunsford,
Hartwig
Luthen, Monika Martiniskova, Peter Martinisko, Norman
McLeod,
Huan Meng, Sirko Molau, Peter Mrazik, Andrzej Skoczewski,
Roger
Venable, Miroslav Vetrik, Barbara Wilson, Dan Xia, Zhou
Xingming.
The selection is simply caused by the process of entering data
into the
Visual Meteor Database; presence or absence of reports is not a
measure of
quality. Please do not complain your report is missing here --
hundreds of
reports are actually missing as yet!
For the first time, a profile of the population index was
computed. It
covers the Asian peak and shows a significant increase of r
during the peak.
The population index was near 2.0 before and after the Asian
peak. It may
have been even lower for other periods which have not been
covered, given
the large number of bright meteors reported.
--------------------------------------------
Sollong NINT ZHR error
r Date/Time
(J2000)
--------------------------------------------
233.6803 6 10.7
2.4 2.00
234.8489 16 16.9 1.7
2.00
235.6417 23 33.6 2.4
2.00
235.7577 18 56.0 4.2
2.00
235.7948 17 72.4 5.2
2.00
235.8300 14 92.0 6.6
2.00
235.8681 14 86.3 6.1
2.00
236.0146 10 141.2 10.1 2.00
236.0442 8 198.7 16.8 2.00
236.0648 9 239.7 18.2 2.00
236.0791 4 312.4 23.4 2.00
236.0873 2 417.9 57.4 2.00
236.0936 6 474.7 34.6 2.00
236.1007 5 641.8 47.6 2.00
236.1090 8 664.1 49.0 2.00
236.1136 12 738.2 55.6 2.00
236.1177 13 691.3 48.9 2.00
236.1217 9 968.3 77.8 2.00
236.1249 10 1241.3 103.4 2.00 Nov 18 1021
236.1282 14 1067.0 77.8 2.00 Nov 18
1026
236.1308 11 1429.3 105.9 2.00 Nov 18 1030
236.1326 11 1032.8 87.0 2.00 Nov 18
1032
236.1348 12 1118.3 89.5 2.00 Nov 18
1035
236.1371 12 1309.6 95.0 2.00 Nov 18
1039
236.1389 9 1284.7 112.2 2.00 Nov 18
1041
236.1408 13 1160.3 86.0 2.00 Nov 18
1044
236.1435 15 1144.5 82.4 2.00 Nov 18
1048
236.1461 13 1006.6 76.8 2.00 Nov 18
1052
236.1495 13 829.9 64.6 2.00
236.1619 10 780.6 55.6 2.00
236.1725 16 735.6 56.9 2.00
236.1871 9 473.9 34.2 2.00
236.2458 8 319.7 22.9 2.00
236.3029 7 371.3 27.1 2.00
236.3256 6 397.6 29.5 2.00
236.3499 9 369.5 35.7 2.01
236.3797 36 507.6 27.1 2.02
236.3975 48 741.1 37.1 2.03
236.4073 45 903.8 46.4 2.03
236.4152 32 1239.2 62.8 2.04
236.4205 27 1321.2 71.1 2.04
236.4251 23 1503.8 76.0 2.05
236.4299 26 1280.1 69.2 2.05
236.4345 19 1753.5 88.5 2.08 Nov 18
1743
236.4386 17 1651.6 87.4 2.11 Nov 18
1749
236.4422 14 1848.2 103.2 2.15 Nov 18 1754
236.4457 14 2057.9 110.2 2.17 Nov 18 1759
236.4484 10 2242.5 130.6 2.17 Nov 18 1803
236.4515 18 1861.9 94.2 2.17 Nov 18
1807
236.4541 11 2112.8 125.4 2.17 Nov 18 1811
236.4561 9 2406.9 121.6 2.17 Nov 18
1814
236.4582 7 2196.5 150.5 2.16 Nov 18
1817
236.4600 10 2630.0 140.8 2.15 Nov 18 1820
236.4621 11 2192.9 121.6 2.15 Nov 18 1823
236.4644 12 1906.7 102.4 2.14 Nov 18 1826
236.4668 13 2370.8 120.2 2.15 Nov 18 1829
236.4690 9 2400.5 137.5 2.17 Nov 18
1832
236.4712 11 1958.0 109.6 2.20 Nov 18 1836
236.4739 13 2160.8 112.8 2.21 Nov 18 1839
236.4765 12 1656.7 93.3 2.18 Nov 18
1843
236.4798 16 1416.5 70.8 2.15 Nov 18
1848
236.4846 13 1482.9 77.9 2.10 Nov 18
1855
236.4882 14 1448.3 73.6 2.07 Nov 18
1900
236.4932 21 1051.6 52.6 2.03
236.4978 19 1222.4 63.0 2.01
236.5034 22 1108.2 55.8 1.99
236.5123 22 1087.2 55.6 1.96
236.5207 29 848.3 42.8 1.92
236.5317 31 759.0 38.7 1.90
236.5465 32 635.8 32.7 1.92
236.6595 40 208.6 10.7 1.96
--------------------------------------------
NINT is the number observing periods involved. We used the
population index
given in the last column, the zenithal exponent is 1.0. Averaging
periods do
not overlap; each period is used only once. Errors are the
+-ZHR/sqrt(n)
margins of the Leonid number n.
Rainer Arlt, 2001 November 26.
=============
(4) LEONID METEOR SHOWER FORECASTS: 'IT LOOKS LIKE WE WERE ALL
WRONG'
>From Space.com, 27 November 2001
http://www.space.com/scienceastronomy/astronomy/leonid_results_011127-1.html
By Robert Roy Britt
Senior Science Writer
Preliminary shooting star tallies and interviews with the four
groups who
predicted this year's Leonid meteor shower reveal that while
strides were
made in the young science of meteor forecasting, nobody got it
right in
2001.
"Right now it looks like we all were wrong, in various
degrees -- perhaps me
worse than others," said Bill Cooke, a NASA scientist whose
forecast for a
peak in Hawaii was most unlike the other three.
Nonetheless, experts say meteor forecasting, if not perfect, is
at least
coming of age. The other three forecasts were not entirely off
base, and
without question the 2001 version of the annual event was a
storm, as
expected by all four research groups.
Scientists classify a meteor storm as one in which the hourly
rate of
shooting stars, calculated over a 15- to 20-minute period,
exceeds 1,000.
Some forecasts had predicted such a rate for North America and
elsewhere,
but there was no agreement on if or where such a storm would take
place.
The Leonid meteor shower is created by dust left in space by
comet
Tempel-Tuttle, which lays down a separate trail each 33.2 years
as it orbits
the Sun. Forecasting the shower involves figuring out which
trails Earth
will pass through and how dense they will be.
High-tech counting
At Mt. Lemmon, Arizona, a group of experienced meteor observers,
using a
high-tech counting technique, gave this report: "We observed
an above 'storm
strength' activity level (> 1000 m/hr ZHR) from about
1000-1130 UTC."
Translation: They saw more than 1,000 meteors per hour just
before dawn on
Sunday, Nov. 18.
Robert Lunsford of the American Meteor Society and six other
people used
remote "smart-mice" to feed their Mt. Lemmon
observations into a PC operated
by James Richardson, using software developed by Morris Jones to
perform
real-time hourly-rate calculations from multiple observers. The
work was
part of a NASA-sponsored research effort at the Ames Research
Center.
What these avid and experienced observers saw was, of course,
similar to
what many amateurs and first-time observers witnessed -- a
glorious storm of
shooting stars that won't be repeated for nearly a century.
A group of international observers northeast of Beijing, China,
counted a
peak hourly rate of 2,400 shooting stars. Other skywatchers in
Asia and
Australia reported rates of nearly 3,000 per hour. In one of the
most widely
watched forecasts, however, researchers David Asher and Rob
McNaught had
predicted an hourly rate for the region of 8,000.
Other scientists used video cameras and radio receivers to record
the event.
Final and official numbers for peak hourly rates, called ZHR, may
not come
for weeks or months, after all the observations are sorted out
and
cross-checked.
But some general conclusions can be drawn.
"The rates for the Western Hemisphere were higher than
expected while those
for the Western Pacific were lower," said Lunsford.
"The shower also
produced better activity for a longer period of time than
expected. At least
the timing was close enough that most people were able to view
the event."
Many observers reported a long peak that began after or lasted
past the
predicted times.
Who won?
Lunsford and Rainer Arlt, an astronomer at Astrophysikalisches
Institut
Potsdam in Germany, both said that a forecast group led by
Finnish scientist
Esko Lyytinen was most accurate at predicting the storm. They had
called for
a peak of 2,000 per hour for North America.
In general, all the forecast groups seemed to do better at
predicting the
timing of peak activity rather than the number of shooting stars
that would
fill the sky during the peak, several scientists said.
"ZHR predictions are still hard to achieve," Arlt said.
The difficulty is
not directly the result of bad prediction models, he said, but
instead is
due to less than perfect data on past storms. Accounts of
previous meteor
showers are often drawn from newspaper articles or amateur
tallies.
Arlt said forecasts for 2002, when another meteor storm is
expected, will
now need to be scrutinized.
The 2002 shower will be accompanied by a full Moon, which will
drown out
most of the fainter meteors. Still, many avid meteor observers
will plan
trips to favorable locations in attempts to recapture the magic
of 2001.
SPACE.com asked a leader from each forecast group how he thought
their work
stacked up against the others this year. Below are the replies,
edited for
brevity and clarity.
[ZHR = peak hourly rate; UT=Universal Time; rev.=revolution (7
rev. means 7
orbits ago for comet Tempel-Tuttle, which leaves a new trail of
debris every
33.2 years. These revolutions are also discussed as the year in
which they
occurred, as in "1699" being a dust trail left in that
year.)]
David Asher (of Armagh Observatory with Rob McNaught):
I haven't had time to assess this. At present my complete guess
is that
Lyytinen et al. may be the 'winners' but that models that
followed the 'dust
trail technique' pioneered by Reznikov et al. were all broadly
correct, as
Rob McNaught and I (among others) were 100 percent sure they
would be, even
though we didn't know which would be the 'winning' model among
them.
The shower was further confirmation that meteor storm prediction
is
essentially solved, albeit many people should be able to do
exciting new
research to try to refine the details.
Esko Lyytinen (with Markku Nissinen, Tom Van Flandern):
According to early data, the rates, especially at the Pacific
area, seem to
be a little below the predicted. The times predicted were quite
good, at
least enough for choosing the observing location.
What is especially interesting is the timing of the 7 rev.
outburst (visible
in Americas). Our last modeling with nongravitational effects put
it about
half-an-hour later than the previous simple trail models. This
seems to be
about the observed (it may have occurred even a bit later). I
think that
this gives quite strong support to our model. Even beforehand I
was very
interested to see the timing of this outburst peak.
Peter Jenniskens (of NASA's Ames Research Center):
Our peak rate from FISTA was about ZHR = 1200/hr peaking at 10:40
UT, while
our ground station at Mt. Lemmon had about 1500/hr. They also
recorded a
narrow spike up to 2600/hr around 11 UT, the cause of which is
not clear
yet. My personal estimate from the ground was around 1500/hr.
Peak ZHR from
our ground station in Australia was about 1900/hr at about 18:15
UT (1866
peak). A modeling would be needed to determine the peak rate and
time of the
1699 peak.
It is clear that a comparison of the video records is needed to
make sure
these numbers are well calibrated. If true, they definitely would
support my
prediction that the 1767 dust trail was closer to Earth's orbit
and the 1866
dust trail further away than earlier predictions by Asher and
McNaught as
well as Lyytinen.
Esko Lyytinen's model did good regarding the peak times,
especially where it
concerns more subtle effects from gravitational perturbations on
the shape
of the dust trail near Earth's orbit. Observations have surpassed
the
sophistication of the model by Asher and McNaught. Brown and Cook
are wrong.
Bill Cooke (of NASA's Marshall Space Flight Center, with Peter
Brown):
If we judge the accuracy of the forecasts from the very
preliminary numbers
we have now using the criteria of intensity and timing, then I
can state the
following:
FIRST PEAK:
Intensity
Asher/McNaught called it to within 20 percent or so
Brown/Cooke also had it right to within 20 percent
Lyytinen/Van Flandern factor of 2 too high
Jenniskens factor of 4 too high.
Timing
Asher/McNaught off by about 30-40 minutes (too early)
Brown/Cooke no peak at this time
Lyytinen /Van Flandern - off by about 30-40 minutes (too early)
Jenniskens - off by about 30-40 minutes (too early)
The 1799 peak predicted by Brown/Cooke apparently did not
materialize, but
it has been suggested that the error in the timing of the first
peak was due
to influence from 1799 material, which was not a significant
influence in
forecasts other than Brown/Cooke.
SECOND PEAK:
Intensity
Asher/McNaught , Lyytinen/Van Flandern 2.5 times too high
Brown/Cooke more than a factor of 3 too low
Jenniskens too high by 33 percent
Timing
Asher/McNaught, Lyytinen/Van Flandern just slightly early
Brown/Cooke about 30 minutes early
Jenniskens about 30 minutes early
[Cook continues:]
This is the way things look now. However, these numbers are very
preliminary
and are almost certain to change (The IMO revised their 1999
numbers at
least 3 times, and that was for only one peak).
Another item of interest is that the data we collected on the
night of the
17th may show a small peak from 1932 and 1965 trails; this was
not predicted
in any forecast.
Copyright 2001, Space.com
============
(5) LISTENING TO LEONIDS
>From NASA Science News, 26 November 2001
http://science.nasa.gov/headlines/y2001/ast26nov_1.htm?list20392
November 26, 2001: All at once there was a eye-squinting flash of
light and
a strange crackling noise. Puzzled sky watchers looked at one
another ...
and confessed: "Yes, I heard it, too."
Hearing meteors? It could happen -- and indeed it did, plenty of
times
during this month's Leonid meteor storm.
"I am sure I could hear several of the meteors,"
recalled Karen Newcombe, a
Leonid watcher from San Francisco -- one of many who reported
meteor sounds
to Science@NASA on Nov. 18th.
"Several times when a Leonid with a persistent
debris train flew directly overhead, I heard a faint fizzing
noise
[instantly]." There was no delay between the sight and the
sound.
"How is that possible when the meteor was so many miles
above my head?" she
wondered.
The same question has bedeviled some of history's greatest
scientists. For
example, in 1719 astronomer Edmund Halley collected accounts of a
widely-observed fireball over England. Many witnesses, wrote
Halley,
"[heard] it hiss as it went along, as if it had been very
near at hand." Yet
his own research proved the meteor was at least "60 English
miles" high.
Sound takes about five minutes to travel such a distance, while
light can do
it in a fraction of a millisecond. Halley could think of no way
for sky
watchers to simultaneously hear and see the meteor.
Baffled, he finally dismissed the reports as "pure
fantasy" -- a view that
held sway for centuries.
Yet just last weekend scores of people little inclined to fantasy
heard the
Leonids. The sounds weren't rumbling sonic booms or the loud
crack of a
distant explosion arriving long after the meteor's flash had come
and gone.
Rather, these were exotic, delicate noises, heard while the
meteor was in
full view. Scientists call them "electrophonic meteor
sounds."
Meteor listeners have long been reluctant to report their
experiences -- a
result of Halley-esque skepticism. But hearing a meteor doesn't
mean you're
crazy. Indeed, modern researchers are increasingly convinced that
the
electrophonic sounds are real.
Colin Keay, a physicist at the University of Newcastle in
Australia, not
only believes in electrophonic meteors, he's also figured out
what causes
them. According to Keay, glowing meteor trails give off not only
visible
light, but also very low frequency (VLF) radio signals. Such
radio waves,
which oscillate at audio frequencies between a few kHz and 30
kHz, travel to
the ground at the speed of light -- solving the vexing problem of
simultaneity.
Of course, human ears can't directly sense radio signals. If Keay
is right,
something on the ground -- a "transducer" -- must be
converting radio waves
into sound waves. In laboratory tests, Keay finds that suitable
transducers
are surprisingly common. Simple materials like aluminum foil,
thin wires,
pine needles -- even dry or frizzy hair -- can intercept and
respond to a
VLF field.
Here's how it works: Radio waves induce currents in electrical
conductors.
"Strong, low-frequency currents can literally shake ordinary
objects,"
explains Dennis Gallagher, a space physicist at the NASA Marshall
Space
Flight Center. "When things shake, they launch vibrations
into the air,
which is what we hear."
Higher-frequency radio waves, like TV transmissions or FM radio
broadcasts,
oscillate much too fast (hundreds of millions of times per
second) to
substantially shake conductors. Even if they did, we couldn't
hear the
resulting MHz-frequency sound waves, which are far above the
frequency range
of a human ear.
But VLF waves can do the job. Keay discovered that even a pair of
glasses
could be made to vibrate slightly. Perhaps that explains the
experience of
Erich in Troy, New York: "When I was out [viewing the
Leonids on Nov.
18th]," he reported, "I had my head back on the ground
and heard a sizzling
sound. My head was close to grass and leaves and I wear wire
frame glasses
as well. The sound was definitely simultaneous with the
observation of a
rather large streak."
But how do meteors generate VLF radio signals?
"It was a knotty problem," recalls Keay. When he began
his work on
electrophonic meteors in the 1970's, physicists had no idea how
VLF waves
might emerge from a meteor's ionized trail. "Some new
mechanism had to be
found."
"[I was inspired by] Fred Hoyle's sunspot theory in which
energy is trapped
in twisted magnetic fields," he says. Magnetic fields that
suddenly untangle
-- snapping back like stretched rubber bands -- can trigger solar
flares:
violent blasts of electromagnetic radiation and energetic
particles.
Perhaps, thought Keay, magnetic fields in the glowing trail of a
meteor
might do something similar.... only on a much less energetic
scale.
Left: Nuclear explosions release VLF radio waves, which are
reportedly
"heard" by soldiers in nearby bunkers. This VLF
spectrum from such an
explosion peaks at 12 kHz. [more]
When a meteoroid races through Earth's atmosphere, the air around
it becomes
a plasma -- that is, a cloud of ionized gas. Plasmas have a
curious
property: Lines of magnetic force that permeate them become
trapped.
Wherever the plasma goes, the magnetic field follows. If a
magnetized plasma
becomes turbulent, the magnetic fields inside it become twisted
and tangled
as well.
The plasma tails of certain meteors do become turbulent, says
Keay, and they
are permeated by a magnetic field: Earth's. "The plasma is
swirling so fast
that the magnetic field can be scrambled up like spaghetti."
And therein
lies a source of energy for VLF waves.
Keay continues: Eventually the plasma cools. Electrons return to
the atoms
from which they were earlier ripped, and the gas becomes neutral
again.
Magnetic fields find themselves suddenly free to straighten out.
That abrupt
rebound is what produces the low frequency radiation.
It's a plausible theory, says Gallagher: "It's easy to
understand and is
supported by Keay's laboratory work."
Gallagher added, "I think what makes this exciting is that
we're talking
about a phenomenon that has been experienced by people for
perhaps thousands
of years. Even in modern times folks who reported hearing such
sounds were
ridiculed. It was only about 25 years ago that Keay was able to
do the
research and legitimize the experiences of all those generations
of people."
"It shows there are still wonders in nature yet to be
recognized and
understood. We should take this experience with meteors as reason
to open
our minds to what may yet be learned."
==========
(6) ESA SCIENTISTS CAPTURE THE LION'S OFFSPRING DOWN UNDER
>From Andrew Yee <ayee@nova.astro.utoronto.ca>
ESA Science News
http://sci2.esa.int/leonids/leonids2001/
Contact:
Dr. Detlef Koschny
ESTEC, Noordwijk, Netherlands
Tel: +31-71-565-4828
Email: detlef.koschny@esa.int
28 November 2001
ESA scientists capture the Lion's offspring Down Under
After an eventful trip to the other side of the world, ESA's
intrepid
scientists have returned with a treasure trove of data about the
2001 Leonid
meteor shower.
>From their remote encampment in the Australian outback, the
four-man team
from the European Space Research and Technology Centre in the
Netherlands
successfully observed many thousands of shooting stars while
carrying out
some groundbreaking trials of new scientific experiments.
Team leader Detlef Koschny and colleague Roland Trautner happily
recounted
their successful campaign to capture the Lion's offspring.
Question: Were you able to see the Leonids as you had hoped?
Koschny: We were rather nervous because the night of the
predicted maximum
was cloudy -- the first cloudy night we had in Australia -- but,
fortunately, the clouds went away and we had three hours of
beautiful
Leonids. We saw the first Leonid fireballs through holes in the
clouds --
this led to quite spectacular views, since the clouds were black
and
basically invisible (an unknown experience to a European
observer, where
there are always lights to illuminate the clouds).
Miraculously, it slowly but steadily cleared up and one hour
after midnight
we had beautiful skies: the Magellanic Clouds were blazing,
Canopus, Sirius
and Achernar brilliant. The show started with about one bright
Leonid (-2
magnitude or brighter) per minute. Most of them
had orange-yellow heads and left a blueish-green trail that
lasted for a few
seconds. A small number showed persistent trails for half a
minute or so.
The highlight was a -2 mag Leonid which flew just above the
southern
horizon, parallel to it for about 90 degrees!
Trautner: It was a great show -- amazing! The most spectacular
view for me
was in the morning twilight (on 19 November), when the Sun was
painting the
sky a cobalt blue, the bright stars and the Milky Way were still
visible,
and there were brilliant fireballs coming in. It was the most
beautiful
moment of the whole night.
We were very lucky because we had good weather at the end. There
had been
cloud and smoke from bush fires earlier in the night. The bush
fires last
for weeks -- the farmers just let them burn. We could see them
getting
closer until they were burning near the road we would have to use
on our
return journey. Fortunately, the fire was already extinguished
when we made
our way back to Broome.
Koschny: The weather was a worry to us. There had been
thunderstorms around
Perth, and we were told that the weather was also bad around Wolf
Crater, so
we decided to camp out at a dry lake nearer Broome. We made the
right
decision.
Question: It sounds as if your observations were successful.
Koschny: We captured many meteors and fireballs on video --
probably several
thousand in total, though we won't know the actual numbers until
we analyse
our tapes. At one point I saw five meteors within one second. My
impression
was that the activity was fairly constant for about three hours.
It was
definitely less activity than the 1999 Leonids that we had
observed from
Spain. There didn't really seem to be a significant peak, but
this may be
because of the observing geometry. We saw a bright fireball every
minute at
first, when the radiant (the apparent source of the Leonids) was
low above
the horizon. Later, as the radiant rose higher in the sky, we
could see a
lot more, fainter meteors.
Our visual observations were reported via satellite phone to
Vladimir Krumov
from the International Meteor Organisation, who kindly acted as
the
coordinator. We obtained about 200 hours of video data from five
intensified
video cameras. Two of the cameras were equipped with objective
gratings, so
we were able to successfully record meteor spectra showing both
emission and
absorption lines, and we can now start to analyse the chemistry
of these
meteors.
We also got some nice recordings from the electric field sensor
that was
measuring the electric field of the atmosphere. The signal was
converted to
the audio range and recorded on the video tape of our wide angle
camera.
Although the camera shows about 200 meteors brighter than +1 mag,
so far we
have not found (heard) any obvious correlation between the
electric field
and a meteor. We will be analysing the data in detail over the
coming weeks
to see if we can find any evidence of this.
Trautner: We suffered from high temperatures -- above 40 C every
day. This
increased the electric current consumption of the MI probe
electronics and
blew the fuses. Another problem we encountered was the power
supply for our
equipment. Fortunately, we were able to recharge our batteries
during the
day using a solar panel and by linking up to our car batteries
and
generators. The solar array was very useful -- it would have been
a disaster
if the car batteries had run dry!
After a number of MI probe test runs, the display on the laptop
controlling
the probe died, so that brought my tests to a sudden end.
However, I had run
sufficient tests before that to get plenty of useful data. It
will be very
valuable for assessing the performance of the new instrument
architecture.
Question: You mentioned the threat from bad weather, heat and
bush fires.
Were there any other problems that you had to overcome?
Trautner: We were driving around looking for a good site to set
up the MI
probe when we had an encounter with a farmer's daughter wielding
a rifle!
She did not realise that her father had given us permission to be
on the
property and thought we were trespassing. She told us in no
uncertain terms
to get off the property. It was only after she rang her father
that she
realised her mistake. She wrote us an apology afterwards.
We also had to keep a look out for lizards. Some of them were up
to 1.5
metres long and they looked like small crocodiles! They were very
shy, but
if we saw any of these animals, we were very respectful! We also
saw a lot
of other animals -- kangaroos, bush turkeys, emus, etc. There
were plenty of
insects too -- sometimes they were a real plague.
Koschny: All in all, it was a fantastic experience. Especially
sitting in
the outback, with nighttime temperatures above 20 deg C, three
hours away
from civilisation, seeing the Magellanic Clouds and the Southern
Cross, was
something I will never forget.
Links:
* Leonids Down Under pages
http://sci2.esa.int/leonids/leonids2001/links.htm
* Leonids meteor page
http://planetary.so.estec.esa.nl/meteors/
and navigate to "Leonids01"
[NOTE: Images supporting this article is available at
http://sci2.esa.int/leonids/leonids2001/]
==============
(7) THE MAGI AND THE STAR
>From Biblical Archaeology Society, 2 December 2001
http://www.bib-arch.org/brd01/magi1.html
The wondrous star that hovered over Bethlehem at Jesus' birth has
long
mystified Bible scholars and astronomers alike. Attempts to
identify the
star with historical celestial phenomena have been inconclusive
at best,
leading many to dismiss the gospel account as a beautiful but
imaginative
myth. Still others keep returning to this question, knowing that
if we could
only link the star with a specific celestial event, we could also
pinpoint
the date of Jesus' birth. For although today we celebrate the
birth of Jesus
in 1 C.E., most scholars believe he was actually born sometime
between 7 and
4 B.C.E., based on the Gospel of Matthew, which indicates that
Jesus was
born late in the reign of King Herod of Judea, who died in 4
B.C.E.*
I believe that Babylonian astronomy may provide the key to
identifying the
star and to dating Jesus' birth: That's because the Gospel of
Matthew tells
us that the magi-astronomers from the East-believed that the star
would lead
them to a new king. Why? What did the magi know?
According to Matthew, after Jesus was born "magi from the
East arrived in
Jerusalem, asking, 'Where is the child who has been born king of
the Jews?
We have observed the rising of his star, and we have come to pay
him
homage'" (Matthew 2:2).
Herod was, of course, disturbed by the news. He called his chief
priests and
scribes before him and asked them where such a child would be
born. They
said Bethlehem (where King David, whose scion would be the
messiah, had been
born). Herod then instructed the magi to continue on their
journey to
Bethlehem: "Go and search diligently for the child,"
Herod advised. "When
you have found him, bring me word so that I may also go and pay
him homage"
(Matthew 2:8). Once they found the child, Herod advised, they
should report
back to him. Secretly, the king planned to destroy the infant.
The magi set out on the road to Bethlehem. "The star that
they had seen in
its rising went ahead of them until it stopped above the place
where the
child lay. At the sight of the star, they were overjoyed.
Entering the
house, they saw the child with Mary his mother, and bowed to the
ground in
homage to him; then they opened their treasures and offered him
gifts: gold,
frankincense and myrrh" (Matthew 2:9-11). Having been warned
in a dream of
Herod's malicious intent, the magi returned home "by another
road" (Matthew
2:12).
The term Matthew uses, magoi ("magi" in English),
refers to Persian
astronomers or scholars, although it is often translated simply
as "wise
men." Matthew does not mention the names or the number of
these wise men,
but according to later Christian tradition, there were three:
Balthassar,
Melchior and Caspar. (For more on the magi in later traditions,
see the
following article in this issue.) Balthassar is a Greek
corruption of the
Babylonian name Belshazzar (, or more simply, Bel-shar-usur)
familiar from
the Book of Daniel; it means "O Lord, protect the
king." Melchior, which
means "The king is my light," is an Aramaic name often
encountered in
Assyrian and Babylonian texts. Caspar (sometimes spelled Gaspar)
is a Roman
corruption of Gondophares (Gadaspar), a Parthian name (the
language of the
people who ruled Persia in Matthew's time). The names of the magi
suggest
that they came from Babylon, a Parthian royal city and one of the
most
important centers of astronomical and astrological knowledge of
the day.
>From its beginnings in the early second millennium B.C.E.,
Babylonian
astronomy was linked with astrology and divination. The royal
courts used
astronomy to interpret celestial events, which were understood as
portents
sent from the gods to the king. Every day, month, part of the sky
and
celestial body or phenomenon had a significance of its own. An
eclipse of
the moon, for example, might be interpreted as a sign that the
king would
die. By the fifth century B.C.E., personal horoscopes were being
used to
predict an individual's future based on the positions of the
planets in
various constellations at the time of his or her birth (that is,
based on
the astrological significance of both the planets in the night
sky at the
time of the birth and the constellations in front of which the
planets
appeared).
The work of Babylonian astronomers was, of course, limited to
what could be
seen by the naked eye, for the telescope would not be invented
until the
Renaissance. (But see "The Stars in the Heavens - Many or a
Few?" BR, Fall
1987.) In planetary terms, this meant astronomers could observe
the
movements of Mercury, Venus, Mars, Saturn and Jupiter, but not
Uranus,
Neptune and Pluto. Nevertheless, between 220 B.C.E. and 75 C.E.,
Babylonian
astronomy had advanced so far that all significant phenomena
involving these
five visible planets and the moon could be accurately computed in
advance.
This is demonstrated in the many Babylonian astronomical almanacs
that have
survived from this period. Like modern almanacs, the Babylonian
texts were
prepared a year in advance and provide a month-by-month account
of what
would be seen in the night sky. The data include lunar and solar
eclipses,
solstices and equinoxes, the first and last dates when stars
would be
visible in the night sky, planetary positions in relation to the
zodiacal
signs, conjunctions (when celestial bodies appear closest to each
other in
the sky) and oppositions (when a planet appears on the opposite
side of the
Earth from the sun; this usually occurs when the planet is
closest to Earth,
as in the diagram in "What the Magi Saw").
Today, we know of several astronomical events that enlivened the
night sky
in the last years of the first millennium B.C.E. and the
beginning of the
first millennium C.E. Identifying one of these as the Star of
Bethlehem
would give us the date of Jesus' birth.
Among the possible candidates is an exceptional light
phenomenon-possibly a
nova (a star that suddenly increases in brightness) or a
supernova (a giant
stellar explosion)-known from ancient Chinese records to have
occurred in
the constellation of Capricorn in 5 B.C.E. However, unlike the
Star of
Bethlehem in the Gospel of Matthew, novas do not move but remain
stationary
in relation to the fixed stars, so this possibility must be
rejected as
unsatisfactory. Chinese and Roman sources also record an
appearance of
Halley's comet from August to October in 12 B.C.E.; but this date
is too far
from the death of Herod to be considered seriously. No other
suitable
observations of comets are known from this period.
Another possibility is a conjunction of Venus and Jupiter in 2
B.C.E. During
a conjunction, two planets appear close to each other in the
night sky. In 2
B.C.E., Jupiter and Venus came so close together that they
appeared to merge
into a single brilliant star, although only for a very short
duration-a
maximum of two hours before their setting. Nevertheless, this
conjunction
must be dismissed because it occurred after Herod's death.
The only remaining candidate is a conjunction of Jupiter and
Saturn in 7
B.C.E.(1) Already in 1604 Johannes Kepler associated this event
with the
birth of Jesus. However, Jupiter and Saturn did not come close
enough to
each other during this conjunction to be seen as a single
exceptionally
bright star. Rather, they remained at least one degree apart
(about two
diameters of the moon), leading one scholar to conclude:
"This fact renders
it impossible to explain the Star of Bethlehem with reference to
that
particular conjunction."(2)
It thus seems that from the viewpoint of modern science, the Star
of
Bethlehem cannot be satisfactorily explained. We will have better
luck,
however, if we turn to ancient science, which sheds light on how
the magi
themselves would have understood these celestial phenomena, in
particular
the conjunction of 7 B.C.E. For although modern scholars might
find it
"impossible" to identify this conjunction of Saturn and
Jupiter with the
magi's star, Babylonian astronomers used the term kakkabu,
"star," to refer
to a single star or planet as well as a constellation.
Further evidence of how ancient astronomers would have understood
this
conjunction has been revealed by excavations in Babylon, which
have
uncovered four clay tablets bearing astronomical computations for
the year 7
B.C.E. (More accurately 7/6 B.C.E., since the Bbylonian lunar
year began at
the vernal equinox (March/April). This almanac indicates that,
from the
beginning of the year, Jupiter and Saturn were continuously
visible in
Pisces for 11 months. In other words, for most of the year the
constellation
Pisces served as a backdrop for the planets Jupiter and Saturn as
they
traveled slowly through the night sky. The movements, stationary
points,
risings and settings of both planets are accurately registered
month by
month (see box, pp. 20-21). They came closest together on three
nights in
May, October and December. It appears from the almanac that
toward the end
of the conjunction, Mars also moved into Pisces; it was visible
near Jupiter
and Saturn in mid-February.
That the almanac survives in four copies is remarkable, and,
indeed, quite
exceptional. The overwhelming majority (85 percent) of the known
almanacs
are available in one copy only, and only two other almanacs are
available in
four or more copies. (One for 71 B.C.E., in four copies, and one
for 69
B.C.E., in five copies.) Unlike modern almanacs, Babylonian
almanacs were
not drawn up for the general public but for the private use of a
handful of
experts, and they were guarded as great scholarly secrets. That
so many
copies exist of this one is all the more surprising when one
considers its
date: Cuneiform texts become rare in the latter half of the first
century
B.C.E. (the latest known cuneiform tablet dates from 75 C.E. and
there are
only four cuneiform tablets altogether from the Christian Era).
The great number of copies has an obvious explanation, however:
An 11-month
conjunction of Jupiter and Saturn in Pisces is an extremely rare
event,
occurring only once every 800 years. Because of the slow
rotational velocity
of both Jupiter (which has a 12-year orbit around the sun) and
Saturn (29.5
years), any conjunction of these planets (the so-called
"great conjunction")
will only happen every 20 years. The 11-month conjunction of 7
B.C.E.,
however, was special in that the planets met three times in
succession in
the same constellation. It can occur only when both planets are
in
opposition to the sun; that is, the sun is on the opposite side
of the Earth
from the planets (see "What the Magi Saw"). Since 7
B.C.E. a triple
conjunction of Saturn and Jupiter has been observed only twice,
in the years
786 and 1583.
For the ancient Babylonian magi, however, the conjunction was not
only
important astronomically, but astrologically and politically.
In the Babylonian system, Jupiter, the largest and brightest
planet, was
known as the star of Marduk, the supreme god of Babylon. Saturn,
the second
largest planet, was the star of the king, the earthly
representative of the
god. The Babylonians called Saturn Kaiwanu, "The Steady
One." The
constellation Pisces was associated with Ea, the god of wisdom,
life and
creation. Pisces was also the last sign in the zodiac-that is,
the last
constellation that the sun passed through each year (see
"What the Magi
Saw"). The conjunction of the planets in Pisces accordingly
portended two
things: the end of the old world order and the birth of a new
savior king
chosen by God. No Babylonian interpretation of this particular
conjunction
is extant-surely because of the great rarity of the event-but we
know that
interpretations of planetary conjunctions were based on an
analysis of the
astrological significance of the planets and the accompanying
circumstances,
particularly the zodiacal sign in which the conjunction took
place. The fact
that Mars, the star of Nergal, the god of war,* joined the
conjunction in
its final phase signified that the new king was to come from the
West,
specifically, from Syria-Palestine, for Mars was the star of
Amurru or the
West (Syria-Palestine) in the Babylonian system. (*With the
establishment of
Greek control over the Near East after the conquests of Alexander
the Great
(fourth century B.C.E.) the most important Babylonian gods became
syncretized with Greek ones. Thus Ishtar, the goddess of love and
beauty,
was equated with Aphrodite; Marduk, the king of gods, was equated
with Zeus;
Nergal, the god of war, was equated with Ares; and so on. The
Greeks also
adapted from the Babylonians the idea of associating the leading
gods of
their pantheon with planets, stars and days of the week. These
associations
were later taken over by the Romans, who in their turn equated
Greek gods
with their own.)
The prediction of such a king would have held wide interest in 7
B.C.E.,
when a power vacuum of sorts prevailed in the Near East. The
Seleucid empire
created by the successors of Alexander the Great had collapsed in
64 B.C.E.,
and its remnants, which included Judea, had been annexed to Rome
as a
province named Syria. The power of Rome had not yet been
consolidated in the
area, however. Even after Augustus changed Rome into an
autocratic monarchy
in 27 B.C.E., his authority was questioned in the East, for the
Roman
emperor, unlike the Seleucid kings and their predecessors, did
not derive
his authority from God. For this reason, many people considered
Roman rule
illegitimate and hoped that a local Near Eastern king appointed
by God would
drive the Romans out of the country and create a better world.
These
messianic expectations are recorded by Josephus and reflected in
the Dead
Sea Scrolls.
The conjunction of 7 B.C.E. would have been interpreted as a
portent of the
birth of precisely this kind of king. The political vistas opened
by it
would not have escaped the attention of any Babylonian
astrologer.
When the year 7 B.C.E. began, Jupiter was already visible in the
night sky.
Saturn appeared soon after, on the third day of the first month,
Nisan (at
the beginning of April). The planets met for the first time on
May 27,
rising in the east at about 2 o'clock in the morning, the
brighter Jupiter
first, and Saturn, considerably dimmer, soon after it.
The second meeting of the planets occurred on the 22nd of Tishri
(October
6). Just as Mars was the star of Amurru (the West), Tishri was
known as the
month of Amurru. This second meeting may have inspired the magi
to head
West. That they chose to visit Herod's court is natural, as he
was
unquestionably one of the most powerful kings of Syria-Palestine.
The magi would have seen a brilliant and suggestive sight.
Jupiter and
Saturn were in opposition to the sun and shining at their
brightest, with
Jupiter (the star of the supreme god) appearing twice as bright
as Sirius,
the brightest star. Appearing directly above Saturn (the star of
the king),
Jupiter thus seemed to embrace and protect Saturn in its light.
The
conjunction was visible through the whole night, setting in the
West. For
the magi, the significance resided in the astrological message,
not the
appearance: Matthew nowhere stresses the brightness of the star.
The journey of about 750 miles from Babylon to Jerusalem took
about three
weeks by donkey or camel. If the magi left for Syria-Palestine in
early
Tishri (October), they would have arrived there well before
November 7, when
Jupiter reached a stationary point (its second) and for a moment
seemed to
come to a stop. This occurs whenever the Earth, traveling at a
faster rate
in its smaller, inner orbit, catches up with Jupiter (or any
outer planet).
As the Earth overtakes the planet, Jupiter appears from our
vantage point to
pause in the sky, then to travel backward (westward) in
retrograde motion
until Earth has passed by. The planet then pauses a second time
and turns
back in an easterly direction (see "What the Magi
Saw"). On November 20,
Saturn reached its (second) stationary point. Both dates-the 7th
for Jupiter
and 20th for Saturn-would fit Matthew's description of a star
stopping above
Bethlehem.
The third conjunction occurred at the time of the full moon, on
the 14th of
Kislev (December 1), about three weeks before the winter
solstice, when the
Babylonians held their annual celebration of the victory of their
savior
god, Nabū, over the forces of±darkness. The magi may well have
associated
the birth of the child they were looking for with this festival,
for the
Mesopotamian king was commonly regarded as an incarnation of
Nabū.
Interestingly, the Babylonians proclaimed Nabū's victory as
"good tidings"
(bussurati) to all the people. Bussurtu, "good
tidings," is the same word as
Hebrew/Aramaic besorah, of which the Biblical euangelion (gospel)
is a Greek
translation.
In Luke, the angel uses this very term to announce Jesus' birth
to the
shepherds keeping watch over their flock by night: "Do not
be afraid; for
see-I am bringing you good news [euangelion = bussurtu] of great
joy for all
the people: to you is born this day in the city of David a
Savior, who is
the Messiah, the Lord" (Luke 2:10-11).
How could a star lead the magi to Jerusalem and Bethlehem? (For
another
theory on how a star could lead the magi, see Dale C. Allison,
Jr., "What
Was the Star that Guided the Magi?" BR, December 1993).
These Babylonian
astronomers would have "followed" a star only based on
its astrological
significance. In 7 B.C.E., they read the message of the
"star"-that a
messiah-king would be born in Syria-Palestine-and they headed to
a leading
political center in the region, King Herod's court. There they
were directed
to Bethlehem; as they traveled, both the planet of the king
(Saturn) and the
planet of the supreme god (Jupiter) would have paused in the sky,
as planets
do when the Earth overtakes them in their orbit. In late
December, at the
winter solstice, the magi would have rejoiced with good news, or
bussurati:
Their savior king was born-several years before the Christian Era
even
began!
(1) The American astronomer Michael Molnar recently presented a
theory that
the star of Bethlehem should be identified with two occultations
of Jupiter
by the moon in Aries in 6 B.C.E. (Molnar, The Star of Bethlehem:
The Legacy
of the Magi [New Brunswick, NJ: Rutgers Univ. Press, 1999]). This
theory
must be rejected, however, since in Babylonian astrology the
occultation of
Jupiter by the moon signified the death of a great king and
famine in the
West, that is, exactly the opposite of what a conjunction of
Jupiter and
Saturn portended. See Hermann Hunger and Simo Parpola,
"Bedeckungen des
Planeten Jupiter durch den Mond," Archiv für
Orientforschung, 29/30
(1983/84), pp. 46-49. (Back)
(2) Heikki Tuori, "The Star of Bethlehem and the
Computer," Uusi Suomi 8.1
(1976) (in Finnish).
Copyright 2001, Biblical Archaeology Society
============
(8) MOON MINING WANT TO INVEST IN THE FINAL FRONTIER?
>From Yahoo! News, 24 November 2001
http://dailynews.yahoo.com/h/nm/20011124/sc/minerals_moon_dc_1.html
By Jeremy Smith
LONDON (Reuters) - Space, the last frontier remaining to be truly
explored
and exploited by man. Vast mineral riches are believed to lie in
its cold
depths, especially on the moon -- an untapped resource just
waiting for its
first commercial landing.
Could it ever be possible to replenish the earth's supplies of
gemstones and
little-known rare metals such as osmium and rhodium by sending
humans, or
even robots, into space to set up mining ventures on the
inhospitable
surface of the moon?
An increasing number of private firms see no reason to wait for
the world's
governments to take the lead and are racing to launch their own
space mining
missions.
``Governments have no reason to go back to the moon. They've been
there,
there's no political reason to go back. But there are a lot of
private
reasons to go back,'' said Ian Randal Strock, a director of
U.S.-based
Artemis Society International (ASI).
ASI is helping sponsor a project to build a commercial manned
moon base and
plans its first lunar flight in the next 10 years. According to
Strock,
technology is not the problem -- rather, just how to raise the
massive
amounts of cash required.
``If we had sufficient money, then it's just a matter of getting
the pieces
together, getting a launch and we're there. The big delay in any
project to
the moon is funding,'' he said.
``We're looking at $1.5 billion for that first flight,'' he said.
``We have
four companies up and running and making money, and we're looking
to send up
a robotic camera in two years.''
The United Nations (news - web sites)' 1979 Moon Treaty, one of
several
international outer space agreements, attempted to define the
scope of
private space activity. However, it was never ratified by some
major powers
such as Russia and the United States.
The treaty stipulated that any wealth obtained from the moon by
any
space-faring nation was to be distributed to all the people of
the world.
One clause, referring to space resources as the ``common heritage
of
mankind,'' has been taken by private firms as legitimizing
efforts to mine
on the moon and asteroids.
The handful of private firms competing to be the first to
establish
commercial lunar mining are convinced of a lucrative market for
whatever
they might eventually ship back to Earth.
To back up their claims, they cite a famous sale of Russian lunar
samples
held at a New York Sotheby's auction in 1993, where a pebble of
moon rock
weighing less than one carat fetched an astounding $442,000, or
$2,200 a
milligram. According to Applied Space Resources (ASR), a moon
mission
costing less than $100 million could return a quantity of lunar
material
with enough demand in the marketplace to make the return on
investment
attractive to financial backers.
A private company based in New York state, ASR aims to send an
unmanned
spacecraft to an unexplored region of the moon and return the
first lunar
samples to earth in more than 25 years.
``We have been at this for four years now -- we can do this
technologically
and we believe that the market exists,'' said Denise Norris,
ASR's
president. ``The biggest hurdle is that we need about three to
three and a
half years to integrate everything.
``If everything moves on schedule, we would be launching within
five
years,'' she said, adding that ASR would soon be looking for $4
million in
financing.
SCARCE METALS
Scientists believe the elements making up most of the earth are
also present
on the moon and make up most of its composition. Analysis of
lunar rock
samples indicates a wide variety of elements, with oxygen and
silicon being
relatively plentiful.
Germanium, molybdenum, tungsten, rhenium and gold rank among the
rarer
metals present, in small percentages. Cobalt, nickel, iron,
aluminum,
magnesium, manganese, calcium, sodium and titanium also feature.
But of more immediate commercial interest are the six elements
known as the
Platinum Group Metals (PGMs) -- iridium, osmium, palladium,
platinum,
rhodium and ruthenium.
Among the world's scarcest metals, the PGMs possess unique
chemical and
physical qualities that make them vital industrial materials.
They are
especially valued for their catalytic functions, conductivity and
resistance
to corrosion. ``There are certain minerals and precious metals
that we are
going to find where the supply is going to drop off soon,'' said
ASR's
Norris. ''I believe that the platinum group metals are going to
be a real
problem on earth, with fuel-cell technology.''
Fuel-cells, which are being developed to operate without fossil
fuels, use
around 10 times more platinum than internal combustion engines,
mainly as a
catalyst. If they were to be in widespread use, platinum demand
would
rocket.
Norris added, ``but it'd be extremely foolish to say we're going
to make a
ton of money selling platinum group metals here. The resources
are there and
there's a lot of stuff up there,'' she said, adding that this was
mostly
from asteroid impacts on the moon.
PRACTICAL PROBLEMS
However, the daunting number of practical problems facing a
would-be moon
miner may prove insurmountable, scientists say.
The largest obstacle is the lack of water, used in large
quantities in most
earth mining operations but only believed to exist as ice at the
lunar
poles. Water has been responsible for shaping the earth with its
alluvial
strata and mineral deposits.
Notwithstanding a similar lack of oxygen, which does exist on the
moon but
is bound up in compounds that are hard to break down, the
low-gravity
situation means that robotic mining would probably be more
sustainable than
sending humans into space.
``Nobody is going to think of doing (moon) mining with human
beings,'' said
Richard Taylor, a council member of the British Interplanetary
Society.
``We aren't going to have little men with tin hats holding picks
in their
hands,'' he said. ``All this exploitation of asteroid material
will be
robotic and remote.''
Finding the actual mineral deposits could also prove tricky.
While the earth concentrates minerals in specific areas by dint
of volcanic
eruptions, the moon is volcanically inactive so new ways of
locating
minerals would have to be found.
So far, there is little hard evidence about in what form or where
minerals
are found on the moon, although scientists have made educated
guesses based
upon studies of lunar soil and rock samples.
``What you want is a means of establishing what exists where, and
whether
there are local concentrations. That requires very comprehensive
mineral
mapping,'' Taylor said.
``The moon has a semi-molten core but we're not going to see
crystal
formation or those types of veining that you would see on the
earth with
precious metals,'' said ASR's Norris. ``There is no
crystallization in the
same way that we see on earth.''
EXORBITANT COSTS
Apart from the serious practical problems involved with any
activity on the
lunar surface, the first obstacle for companies looking to mine
on the moon
is cost -- and return on investment.
Experts say the cost of transporting items into space is
exorbitant, ranging
between $2,000 and $3,000 per pound of weight, meaning that any
lunar bases
would really have to be able to procure their necessities from
space.
``If there was a layer of gold a foot thick floating over the
earth at an
altitude at which we could send up a shuttle to go up and
collect, it
wouldn't be worth doing it,'' said Taylor.
``This is for the simple reason that it would cost more per gram
to go up
and bring the gold back than the gold would actually fetch,'' he
said. ``And
a lot of these metals have high values on earth only because they
are
rare.''
The real key to lunar mining, Taylor said, was to reduce the cost
of sending
a craft into space so that its operators could afford to have a
vehicle
which went up partially empty into space and came back partially
empty.
================
(9) ENVIRO-SCARE OF THE DAY: ANIMALS 'FACING CRISIS SIMILAR TO
THAT WHICH
KILLED DINOSAURS'
>From The Guardian, 29 November 2001
http://www.guardian.co.uk/uk_news/story/0,3604,608510,00.html
SCIENTIST WARNS OF SIXTH GREAT EXTINCTION OF WILDLIFE
Tim Radford, science editor
Humankind is presiding over an extinction of plant and animal
species that
matches (sic!) the catastrophe of the dinosaurs 65m years ago, a
British
scientist warned last night. Lord May - until last year the
government's
chief scientist, and now president of the Royal Society -
calculated that
the extinction of birds and mammals was probably 100 to 1,000
times faster
than the average through many millions of years of history.
Studies of
fossils had pointed to five great extinctions in the past.
"There is little doubt that we are standing on the breaking
tip of the sixth
great wave of extinction in the history of life on earth. It is
different
from the others in that it is caused not by external events, but
by us - by
the fact that we consume somewhere between a quarter and a half
of all the
plants grown last year," he told an audience at the Natural
History Museum
in London.
Humans have longer and healthier lives, even in the poorest
countries. The
difference in average life expectancy at birth between the
developed and the
developing world has shrunk in the past 50 years from 26 years to
12 years.
Food production has doubled in the past 35 years, and there is
more food per
person than ever before, even if it was unevenly distributed, he
said.
"The fact that we have more land under cultivation and do it
more
intensively enables us to get closer and closer to realising what
has been
the dream of agriculture since its dawn, which is to grow crops
that no one
eats but us, not shared with weeds or insect pests. That has
implications
all the way down the food chain for biological diversity,"
he said.
But this question was complicated by ignorance, he said. Humans
had named
1.5m creatures so far. There might be 3m other species on the
planet, or
100m.
"But you can't say with any certainty to within a factor of
10. So if we
don't know within a factor of 10 how many animals and plants
there are
alive, anyone who tells you the number of animals going extinct
this year is
an idiot," Lord May said.
But he compared the known rates of extinction of birds and
mammals, put
conservatively at one a year over the last century, with the
rates of
extinction gleaned from a study of past eras of life.
"If mammals and birds are typical, then the documented
extinction rate over
the past century has been running 100 to more like 1,000 times
above the
average background rate in the fossil record. And if we look into
the coming
century it is going to increase.
"An extinction rate 1,000 times above the background rate
puts us in the
ballpark of the acceleration of extinction rates that
characterised the big
five mass extinctions in the fossil record, such as the thing
that killed
the dinosaurs."
Lord May said he thought it a weak argument that what was being
lost was the
raw material for tomorrow's biotechnology. In 20 years, humans
would be able
to design their own medicines.
There was a more broad argument that humans depended on services
from nature
- the cost of cleaning water and pollinating crops and so on -
and these
were worth at least the entire estimated global gross domestic
product of
$30 trillion (£21 trillion).
"Again, there is doubt that if we go too far, we will really
make a mess of
it. Again, I personally doubt it. I think it possible that we are
clever
enough to live in a hugely simplified world."
He added that humans might be required to act today on behalf of
a distant
future. "And that is not something for which we or any other
species have
any evolutionary experience.
"That's the core of the problem. And there are no easy
answers."
Five past extinctions · Some event near end of the Ordovician
period, 440m
years ago, wiped out almost all corals and fish, and 25% of all
families of
creatures
· Near the end of the Devonian period 370m years ago, many
species of fish
and 70% of marine invertebrates perished
· At the end of the Permian period 225m years ago, between 80%
and 96% of
all living marine species were extinguished
· The Triassic period ended 210m years ago with another mass
extinction of
sea creatures, and some land animals as well
· The Cretaceous period ended 65m years ago with the
obliteration of the
dinosaurs. Many physicists suspect the Earth suffered a direct
hit from an
asteroid or that a comet could be to blame for the extinction
Copyright 2001, The Guardian
MODERATOR'S NOTE:
================
(10) SCARE ABOUT SPECIES EXTINCTION GREATLY EXAGGERATED
By Julian L. Simon and Aaron Wildavsky
http://www.positivepress.com/pn/essays/stateof2.php3
Species extinction is a key issue for the environmental movement.
It is the
subject of magazine stories with titles like "Playing Dice
with Megadeath"
with a subhead "The odds are good that we will exterminate
half the world's
species within the next century" (Diamond, 1990, p. 55).
Species "loss" also
is the focal point of fundraising from the public. And the
Congress is asked
again and again for large sums of public money to be used
directly and
indirectly for programs to protect species and for "debt for
Nature" swaps.
The central assertion is that species are dying off at a rate
that is
unprecedently high, and dangerous to humanity. The World Wildlife
Fund,
which publicizes this issue widely, frames the proposition as
follows:
"Without firing a shot, we may kill one-fifth of all species
of life on this
planet in the next 10 years."
The issue came to scientific prominence in 1979 with Myers's The
Sinking
Ark, and then was brought to an international public and onto the
U. S.
policy agenda by the 1980 Global 2000 Report to the President
(referred to
hereafter as "GTR"). These still are the canonical
texts.
GTR forecast extraordinary losses of species between 1980 and
2000.
"Extinctions of plant and animal species will increase
dramatically.
Hundreds of thousands of species--perhaps as many as 20 percent
of all
species on earth--will be irretrievably lost as their habitats
vanish,
especially in tropical forests" (U.S., l980, I, p. 3).
In 1984 we reviewed the data on the observed rates of species
extinction. We
found that the scientific evidence was wildly at variance with
the
by-then-conventional wisdom, and did not provide support for the
various
policies suggested to deal with the purported dangers. We also
reminded
readers that recent scientific and technical advances -
especially seed
banks, and the extraordinary leaps in knowledge of genetic
engineering
though it is still in its infancy, and perhaps electronic
mass-testing of
new drugs - had rendered much less crucial the maintenance of a
particular
species of plant life in its natural habitat than would have been
the case
in earlier years. But the bandwagon of the species extinction
issue
continues to roll with ever-increasing speed.
Now we revise our presentation of the empirical and theoretical
situations
in light of the literature that has appeared in the 1980s. We
find that our
earlier conclusions remain sound. And our conclusions may be
considered
greatly strengthened by the absence of new countervailing
material coming to
light since then, and by a recent "official" review of
this subject by
ecologists themselves which accords with our earlier assessment.
These are the key questions: Are species defined with sufficient
clarity so
that different people can arrive at satisfactorily similar
estimates? What
is the history of species extinction until now? What are the most
reasonable
forecasts of future extinction? What will be the results of
extinctions
(including resulting new additions) on species diversity? What
will be the
economic and non-economic impacts of the expected course of
species
diversity?
Society properly is concerned about possible dangers to species.
Individual
species, and perhaps all species taken together, constitute a
valuable
endowment, and we should guard their survival just as we guard
our other
physical and social assets. But we should strive for as clear and
unbiased
an understanding as possible in order to make the best possible
judgments
about how much time and money to spend in guarding them, in a
world in which
this valuable activity must compete with other valuable
activities,
including the guarding of valuable aspects of civilization and of
human
life.
The importance of the topic is clear from the far-reaching extent
of the
policies suggested. Edward O. Wilson and Paul Ehrlich actually
ask that
governments act "to reduce the scale of human
activities." More
specifically, they want us "to cease 'developing' any more
relatively
undisturbed land," because "Every new shopping center
built in the
California chaparral, every swamp converted into a rice paddy or
shrimp farm
means less biodiversity" (1991, p. 761).
...for data and evidence see
http://www.positivepress.com/pn/essays/stateof2.php3
SUMMARY AND CONCLUSION
The scare about species extinction has been manufactured in
complete
contradiction to the scientific data. The highest proven observed
rate of
extinction until now is only one species per year. Yet the
"official"
forecast has been 40,000 species dying out per year in this
century, a
million in all. It is truth that is becoming extinct, not
species.
The argument that because we do not know how many species are
being
extinguished, we should therefore take steps to protect them, is
logically
indistinguishable from the argument that because we do not know
at what rate
the angels dancing on the head of a pin are dying off, we should
undertake
vast programs to preserve them. And it smacks of the condemnation
to death
of witches in Salem on the basis of "spectral evidence"
by "afflicted" young
girls, charges that the accused could not rebut with any
conceivable
material evidence.
If something is unknowable at present but knowable in principle,
then the
appropriate thing is to find out. This does not necessarily mean
finding out
by direct observation only. A solid chain of empirical evidence
can lead to
a reasonable conclusion. But there must be some reasonable chain
of evidence
and reasoning.
If something is unknowable in principle, at least with
contemporary
techniques, then there is no warrant for any public actions
whatsoever. To
assert otherwise is to open the door to public actions and
expenditures on
behalf of anyone who can generate an exciting and frightening
hypothetical
scenario.
Some say the numbers do not matter scientifically. The policy
implications
would be the same, they say, even if the numbers were different
even by
several orders of magnitude. But if so, why mention any numbers
at all? The
answer, quite clearly, is that these numbers do matter in one
important way:
they have the power to frighten the public in a fashion that
smaller numbers
would not. We can find no scientific justification for such use
of numbers.
Some have said: But was not Rachel Carson's Silent Spring an
important force
for good even though it exaggerated? Maybe so. But the account is
not yet
closed on the indirect and long-run consequences of ill-founded
concerns
about environmental dangers. And it seems to us that, without
some very
special justification, there is a strong presumption in favor of
stating the
facts as best we know them, especially in a scientific context,
rather than
in any manipulation of them.
At a time when there appear frequent reports on the extraordinary
possibilities of genetic engineering, (for example, "Animals
Altered to
Produce Medicine in Milk...Scientists Say Rare Drugs Could be
Manufactured
with Relative Ease" (The Washington Post, August 27, 1991,
p. 1)) - it is
beginning to seem ludicrous to justify extraordinary expense for
protect an
animal like the grey squirrel - which may not even be genetically
distinct -
on the grounds that its gene pool will be valuable for human life
in the
future.
Still, the question exists: How should decisions be made, and
sound policies
formulated, with respect to the danger of species extinction? We
do not
offer a full answer. One cannot simply propose saving all species
at any
cost, any more than one can propose a policy of saving all human
lives at
any cost.
Then we must also try to get more reliable information about the
number of
species that might be lost with various forest changes. This is,
of course,
a very tough task, too, one that might exercise the best
faculties of a
statistician and designer of experiments. One suggestion: if the
population
sizes of selected species could be measured in a series of
periods along
with experimental or non-experimental changes in habitats,
extrapolation
might teach something about conditions that would cause species
to approach
or reach extinction.
Lastly, policy analysis concerning species loss must explicitly
evaluate the
total cost of the protection, for example, cessation of foresting
in an
area. And such a total cost estimate must include the long-run
indirect
costs of reduction in economic growth to a community's health, as
well as
the short-run costs of foregone wood or agricultural sales (see
Wildavsky,
1988, and Keeney, 1990). To ignore such indirect costs because
they are hard
to estimate would be no more reasonable than ignoring the loss of
species
that we have not as yet identified.
We summarize the situation as follows: There is now no prima
facie case for
any expensive species-safeguarding policy without more extensive
analysis
than has been done heretofore. But the question deserves deeper
thought, and
more careful and wide ranging analysis, than has been done until
now. As
children say, just saying so does not make it so.
============================
* LETTERS TO THE MODERATOR *
============================
(11) EDGAR ALLAN POE & HISTORY
>From Hermann Burchard <burchar@mail.math.okstate.edu>
Dear Benny,
thanks for that astounding quote from Edgar Allan Poe's dialog
(CCNet Nov
26) which may be as much history as fiction, especially in this
passage:
"..popular prejudices and vulgar errors in regard to
pestilences and wars
- errors which were wont to prevail upon every appearance of a
comet."
Comet fears in the Middle Ages, here recalled by Poe, are
familiar from the
appearance of Halley's comet in the Bayeux tapestry, often noted
as an
example as well as from other historical accounts. Such fears
probably were
a rational response to past experiences of humanity preserved in
collective
memory over centuries by the populace, in bards' songs or old
wives tales.
Similar feats of ancient oral traditions are famous from the Near
East to
India, so why should we not expect for stories of the Justinian
plague
accompanied by cometary sightings to have survived, and of wars,
too, that
erupted when food supplies became scarce and needed to be guarded
[see Mike
Baillie, "From Exodus to Arthur"].
No longer is comet fear just another one of those
"superstitions" of
irrational people lightly dismissed as backward medieval
peasants. Here is
an occasion to discern the enduring utility of human reason
across the ages,
giving us power to deal with a lot of trouble that fate or the
universe may throw at us.
Regards,
Hermann
===========
(12) BE OF GOOD CHEER
>From Andy Smith <astrosafe@yahoo.com>
Hello Benny and CCNet,
Our Special Role
The few hundred of us who participate in this valuable network
are the world
forum, at this time, regarding the most important technical
challenge in
history. Every major paradigm shift seems to start this
way...with a few
enlightened people trying to get the attention of the
powers-that-be.
It is truly sobering to realize that we few bear the burden of
responsibility for the future of life, on earth. We have stepped
across the
threshold between innocence and awareness. We have tasted the
forbidden
fruit...perhaps just in time....and it is the awareness of that
responsibility which drives many of us. There is no doubt that
our
generation has been chosen (from at least 40,000) for the supreme
test.
We understand the frustrations of our British colleagues and we
want to
thank them for what they are doing and urge "patience and
fortitude". It
might be good to press, in all countries, for global cooperation.
The
Parliament seemed to be receptive to such initiatives.
The Net Forum and Action Center
The CCNet is many good things. It is the global forum for the
exchange of
information and ideas and it is a place to formulate and discuss
actions we
may wish to take, to promote asteroid/comet emergency prevention
and
preparedness and protection from some of the other
world-threatening forces
(warming, gamma irradiation, etc.)
It will take a lot of work, within each country, to identify and
inform the
proper policy makers and to get them to help us, in the building
of a larger
World constituency. We urge each national group, within the Net,
to try to
make these contacts. Now that the United Nations is taking an
interest in
the NEO problem, it is expecially important to have national
advocates, in
the policy making groups. After the advocates have been
identified, initial
contacts can be made using the AIAA International Program. We
will be happy
to help you with the AIAA contacts.
In the U.S., it is still amazing how many of the key people have
almost no
NEO information or awareness and this picture is further
complicated by the
political changes that are constantly taking place...and the
accompanying
needs for information. Such major changes are now taking
place in NASA and
in the Office of Science and Technology Policy. It is important
for us to
work togeather, nationally and internationally, as we try to help
the new
leaders and their staffs to get up-to-speed.
Minor Planet Center (MPC) Support
We see this as an extremely important program which the CCNet
might be able
to assist. The MPC seems to need fairly limited additional
funding, to
upgrade the data processing equipment and to add a few supporting
staff
members. Helping to find ways to meet this vital need could be a
great way
of starting the needed global program, and we want to do all we
can to help.
It seems IAU Commission 20 (C-20)and other related groups could
provide the
leadership and identify the funding channels which could be used
for
contributions and grants. C-20 is a very large group (about 200
institutions
and individuals). Many of the members are key figures in the
asteroid/comet
hunt....and it may be possible for those institutions and
volunteers and
contributors (from the other related specialties), to find the
funds and, in
some cases, the equipment needed by the MPC.
We hope the C-20 and/or the MPC will tell us what we can do to
help with
this important cause. The MPC workload is increasing daily. They
are doing a
tremendous amount or work, with their limited resources, and we
feel a sense
of urgency about getting them some help.
Super Asteroid/Comet Telescope (SAT)
We understand that the design work, on the Dark Matter Telescope
(DMT), is
proceeding well. This 8 meter, 900 mega-pixel wonder...which can
reduce the
time required to inventory the dangerous NEO population, from
more than a
century to about a decade, may be another opportunity for
international
cooperation. This effort is well represented on the Web.
Space and Robotics 2002 Conference
We are planning another asteroid/comet workshop, at this
conference, which
is being co-sponsored by the American Society of Civil Engineers
and others,
in late March. One of the areas of emphasis will be the
engineering of
disaster-resistant tall buildings. We will look at both tsunami
and
impact/fire resistance. In addition, we will survey activities in
all of the
areas related to asteroid and comet emergency prevention and
preparedness
(ACEPP). There is still time for abstracts and I invite anyone
interested to
contact me, soon.
Spaceguard/Japan Activity
It seems operations are underway, now, at the new facility, in
Japan, and we
hope they will soon be at full productivity and can help us get
the world
NEO discovery rate above 1,000, next year. Ten years ago we were
just
starting to average 10 new ones or so, per year...thanks to
SPACEWATCH. This
year LINEAR, NEAT, SPACEWATCH and LONEOS are all doing well and
we
appreciate their efforts, greatly. We hope CATALINA (North and
South) will
soon be back in the race.
Multi-diciplinary and Multi-national Teamwork is Great
Active participation, by astronomers, geologists,
anthropologists,
paleontologists, space and nuclear systems engineers, civil
emergency and
safety specialists, agricultural and medical specialists and
others, from
many countries, is essential, if we are to prepare to protect
ourselves....and each of these groups has cultural markings and
may find it
difficult, sometimes, to be open to outsiders and to be
understanding. We
want to compliment the Net members for the efforts they have
made, to-date,
to talk and work togeather. We hope that this attitude will
encourage others
to participate in this important positive and open dialogue. We
also want to
thank Benny for being such a gracious and dedicated host.
Cheers,
Andy Smith
============
(13) SCIENTIFIC RESPONSIBILITY AND PUBLIC PERCEPTION OF RISK
>From Michael Paine <mpaine@tpgi.com.au>
Dear Benny,
Australian ABC radio has a topic relevant to CCNet this weekend:
OCKHAM'S
RAZOR http://www.abc.net.au/rn/science/ockham/
"Scientific responsibility and public perception of risk, Dr
Robert Hunter
Sunday December 2, 8.45am and Monday December 3, 2.15pm The human
race has
always been subjected to risk, from the hunter/gatherer societies
right through to the
industrial revolution. But we are much happier to shoulder
voluntary risk than to have risk
thrust upon us. Dr Robert Hunter from the School of Chemistry at
the University of
Sydney looks at what generates our dread response and
acknowledges that once
it surfaces it is very difficult to suppress."
Also this week's Nature has an item "Election result leaves
Australian
scientists fearful over funding". Unfortunately I no longer
have an online
subscription to this journal but the title says it all! For those
who don't
know, the Howard government that stopped funding the Australian
NEO search
program in 1996 recently got re-elected, partly due to the tense
international situation and a devisive campaign against refugee
boat people
entering Australia. Many here are ashamed of the negative stances
taken by
the government on numerous international issues, including
Spaceguard.
regards
Michael Paine
===============
(14) AND FINALLY: INTERNET ASTEROID CLASH
>From Science, 23 November 2001, vol 294, p. 1649
A new study concluding that astronomers have overstated the risk
of an
Earth-asteroid wreck is taking a pounding of its own in an
Internet parody.
In the November Astronomical Journal, Princeton astronomer Zeljko
Ivezic
used the latest images of the asteroid belt to calculate that the
chance of
an asteroid (sic) hitting Earth is 1 in 5000 every century. That
is
one-third lower than previous guesses (sic), prompting Ivezic to
issue a
widely covered press release saying that earthlings should feel a
lot safer.
But other doomsday prognosticators say Ivezic's study is headed
for a crash
landing. In an anonymous parody press release entitled
"Chance of Being
Eaten by Wild Animals Greatly Downgraded," an acidic critic
ridicules
Ivezic's methods. The spoof, posted on 12 November on a scholarly
e-mail
list called the Cambridge Conference Network, argues that using
the number
of chunks in the asteroid belt to calculate the likelihood of
Armageddon is
akin to using
the number of hippos in Africa to estimate the chance of being
chewed by a
wild animal in North America. The parody is thinly veiled
partisanship for a
second approach to collision prediction used by previous studies:
directly
counting (sic) only asteroids that have left the belt and become
potential
threats. Ivezic says the posting is "amusing." His
colleagues' scrutiny, he
adds, improves the science.
Copyright 2001, AAAS
-------------------------------------------------------------------
THE CAMBRIDGE-CONFERENCE NETWORK (CCNet)
--------------------------------------------------------------------
The CCNet is a scholarly electronic network. To
subscribe/unsubscribe,
please contact the moderator Benny J Peiser <b.j.peiser@livjm.ac.uk>.
Information circulated on this network is for scholarly and
educational use
only. The attached information may not be copied or reproduced
for
any other purposes without prior permission of the copyright
holders. The
fully indexed archive of the CCNet, from February 1997 on, can be
found at
http://abob.libs.uga.edu/bobk/cccmenu.html
DISCLAIMER: The opinions, beliefs and viewpoints expressed in the
articles
and texts and in other CCNet contributions do not necessarily
reflect the
opinions, beliefs and viewpoints of the moderator of this
network.
*
NEOs: AN OPPORTUNITY FOR ALL UK ASTRONOMY AND SPACE SCIENCE
>From Duncan Steel <D.I.Steel@salford.ac.uk>
Dear Benny,
CCNet readers who live within range of London might like to
attend the
discussion meeting on near-Earth objects to be held at the Royal
Astronomical Society on Friday, December 14th. All interested
parties will
be welcome. There will be a press release issued a few days
before the
meeting, and we will be pleased to answer enquiries from the
media.
The programme for the meeting is given below. Further information
about the
location, and so on, may be gained from the RAS web site:
http://www.ras.org.uk/meetings.htm
Duncan Steel
=======================================================================
http://www.ras.org.uk/meetings/2001/011214.htm
"NEOs: AN OPPORTUNITY FOR ALL UK ASTRONOMY AND SPACE
SCIENCE"
Organisers:
Dr Duncan STEEL (Salford)
D.I.Steel@salford.ac.uk
and
Professor Mark BAILEY (Armagh Observatory)
meb@star.arm.ac.uk
9:30 Registration and Coffee
Morning Session
Chair: Dr Duncan Steel (Salford)
10:30 Dr Duncan Steel
(Salford):
"Introductory
comments and overview"
10:45 Dr Alan Fitzsimmons (QUB):
"Observing NEOs
with UK-supported ground-based telescopes"
11:10 Dr Peter Wheatley (Leicester):
"NEOs in the UK
Wide-field Automated Survey Programme (WASP)"
11:25 Dr John Zarnecki
(OU):
"NEO-related
research at the Open University"
11:45 Dr Sarah Dunkin (Rutherford Appleton
Laboratory):
"Inner-Earth NEO
searches using BepiColombo"
12:00 Dr Wyn Evans (University of Oxford):
"GAIA: A census
of the Solar System"
12:20 Dr Phil Palmer (Surrey):
"Research at
Surrey University for a NEO mission: Affordable access
for science in
space"
12:40 Dr Apostolos Christou (Armagh
Observatory):
"Nearer than the
Moon: dynamics and future opportunities for NEO
missions"
13:00 LUNCH
Afternoon Session
Chair: Professor Mark Bailey (Armagh Observatory)
14:00 Dr Nigel Holloway (Spaceguard UK):
"NEO Impacts:
Risk perceptions and realities"
14:20 Dr Benny Peiser (Liverpool John Moores):
"Asteroid Scares:
Near-Earth Objects and the media"
14:35 Dr Iain Gilmour (OU):
"The ESF-Impact
programme: current objectives and future directions"
14:55 Dr Colin Hicks (Director, BNSC):
"Government
policy and future plans on NEOs"
15:20 Professor Mark Bailey (Armagh):
"Concluding
remarks"
15:30 TEA
At Savile Row followed
by the A&G (Ordinary) Meeting
10:00 Registration: No charge. Coffee will be
provided in the Lower
Library of the Geological Society
A simple lunch will be
available for purchase in the Lower Library
of the Geological Society
15:30 Tea will be provided in the Scientific
Societies Lecture Theatre,
Savile Row, for those attending the Monthly A&G
(Ordinary) Meeting.
A Drinks Party will be
held in the Coffee Room of the Scientific
Society's Lecture
Theatre 18:00 to 19:00, cost just £1.00 per head.
Posters:
(1) The Atlas Programme: A comprehensive campaign to discover,
explore and
understand NEOs
Paolo D'Arrigo (Astrium Ltd), Andrew J. Ball (OU), Philip A.
Bland
(OU), Mark Cropper (MSSL), Alan Fitzsimmons (QUB), Ian A. Franchi
(OU),
Monica M. Grady (OU & NHM), Simon F. Green (OU), Neil McBride
(OU), Derek
Pullan (Leicester), Mark Sims (Leicester), Mark F. Smith (Astrium
Ltd),
Nigel Wells (QinetiQ), Ian P. Wright (OU) & John C. Zarnecki
(OU).
(2) NEO Observational capabilities of UK amateur astronomers
Roger Dymock
(3) Optical colours of near earth objects
Catherine Dandy, Alan Fitzsimmons, Simon Collander-Brown (QUB),
Mark
Bailey & David Asher (Armagh Observatory)
(4) What Venus and the Moon tell us about the present-day NEO
influx to
Earth
David Hughes (Sheffield)
(5) Determining impact directions from planetary craters: A
method of
constraining the orbital distributions of minor bodies David
Wallis
(OU)
(6) The Anglo-Australian near-earth asteroid survey
Duncan Steel (Salford)
To speak at the Monthly A&G (Ordinary) Meeting, Scientific
Societies Lecture
Theatre, Savile Row - 16:00 Please see programme for full
details
Hans Haubold (Director, UN Office for Outer Space Affairs,
Vienna)
"United Nations Initiatives on NEOs"
Marcello Coradini (Coordinator, Solar System Missions, ESA)
"ESA's contribution to the understanding of NEOs and their
related
problems"