HDTenEightyP/NetNews huggingface dataset:
From: tk@ai.mit.edu (Tom Knight)
Newsgroups: sci.astro,sci.space
Subject: Re: Too thin for light pressure? (was Re: Diesen sphere or Strungen Sphere)
Date: 15 Oct 92 20:23:24 GMT
	<Bw2zHD.AvI@news.cso.uiuc.edu>
	<1992Oct14.001905.25147@infodev.cam.ac.uk>
	<1992Oct14.013809.1@fnalc.fnal.gov>
	<NICKH.92Oct14161614@VOILA.VENARI.CS.CMU.EDU>
Followup-To: sci.astro
Organization: MIT Artificial Intelligence Laboratory
In-reply-to: nickh@CS.CMU.EDU's message of 14 Oct 92 21:16:14 GMT

In article <1992Oct14.013809.1@fnalc.fnal.gov> higgins@fnalc.fnal.gov
      (Bill Higgins-- Beam Jockey) writes:

   I doubt whether 3 microns is enough to be reasonably opaque, let alone
   a nearly perfect reflector (which you want when building a solar
   sail.)

3 microns is more than sufficient to be totally opaque for a metal.
Silicon is barely transparent in the far red in a thickness of 2 microns.
Newsgroups: sci.astro
From: mccreary@sword.eng.hou.compaq.com (Ed McCreary)
Subject: Re: Diesen sphere or Strungen Sphere
Organization: Compaq Computer Corp.
Date: Mon, 12 Oct 1992 19:09:54 GMT

In article <Bw0poC.E4z@Novell.COM> steve_olson@npd.novell.com writes:
>Does anyone know any thing about a Diesen sphere or a Strungen Sphere? 
>It is supposed to be a sphere with a star in the middle. 
>
>I first saw it on Star Trek, you should see it in this weeks episode, I saw 
>the sattelite feed on Sunday.  Our local university astronomer told me that
>the sphere is actually called the strungen sphere, but on ST they refer to
>it as a Diesen Sphere.
>
>Steveo
>

Dyson sphere, after Freeman Dyson.  Larry Niven was inspired by it
to come up with the Ringworld which is a strip from a Dyson sphere.

--
In the midst of the word he was trying to say,|McCreary@sword.eng.hou.compaq.com
     In the midst of his laughter and glee,   |Me, speak for Compaq?  
He had softly and suddenly vanished away---   |Yeah, right.
     For the Snark *was* a Boojum, you see.   |#include <stddisclaimer.h>
Newsgroups: sci.astro
From: fischer@physun.physics.mcmaster.ca (Phil Fischer)
Subject: Re: OOOPS
Organization: Dept. of Physics & Astronomy, McMaster University
Date: Wed, 14 Oct 1992 19:27:27 GMT

In article <1963@shaman.wv.tek.com> harmons@mithril.wv.tek.com (Harmon Sommer) writes:
>OOOPS. I goofed. Newspaper article said 100 Billion stars in our galaxy, not
>in our solar system. But I still wonder who counted them.


This is exactly the sort of thing astronomers do.
-- 
Phil Fischer                         | Hamilton, Ont.
fischer@crocus.physics.mcmaster.ca   | Canada
Dept. of Physics and Astronomy       | L8S 4M1
McMaster University                  | 416-525-9140 X 4574
From: brown@hpspkla.spk.hp.com (Pat R. Brown)
Newsgroups: sci.astro
Subject: Debris from Meteor Shower Friday??
Date: 12 Oct 92 15:48:52 GMT
Organization: Hewlett Packard Company, Spokane, Wa.

The local news and CNN reported "debris falling" from the Meteor Shower 
the end of last week. Can any of you professionals confirm or deny?
It is my understanding that meteor showers deliver micro particles to the 
surface of the earth but I have yet to hear of any 1 gram or larger 
particles. There was another report by a commercial pilot reporting 
meteors visable from 30, 000 feet. Further this shower was reportedly 
much better on the east coast of the US. Any reports?

Thanks form Pat, an amateur meteoriticist in Greenacres, Wa
From: bob@kc2wz.bubble.org (Bob Billson)
Newsgroups: sci.astro
Subject: Re: ALTERNATIVE Comet Rendezvous Mission
Summary: is there a full moon?
Keywords: oh no
Date: 9 Oct 92 06:05:04 GMT
Distribution: na
Organization: Color Computer 3: Tandy's 'game' machine

mcelwre@cnsvax.uwec.edu says:
>
>
>                      ALTERNATIVE Comet Rendezvous Mission
>
>               The two proposed NASA comet rendezvous and sample return 
>          missions are expected to cost BILLIONS of dollars, take 
>          nearly 20 years from now to complete, and could FAIL in 
>          DOZENS of ways! 

[_much_ non-sense [sic] deleted]

Tell me someone, is there a permanent full moon?  Did sci.astro get rename
to alt.weird.theories?  Did someone leave gates open at the local "New Age
Farm"?  First it is space potato[e]s, than its a math prof expounding on 
moving a planet out of its orbit, now this...

>          deployed beginning in the Fall of 1977.  In late 1977 and 
>          early 1978, there was a strange rash of giant AIR BOOMS along 
>          the East Coast of the U.S and elsewhere.  The AIR BOOMS were 
>          never satifactorily explained, by either the government or 
>          news media.

Yup, must be those Russians.  Couldn't be anything simple like U.S. military
flights, now could it?

>          CREDIBILITY of Dr. Beter

Sounds about as credible as Nostradamus [chuckle].

>               UN-altered REPRODUCTION and DISSEMINATION of this 
>          IMPORTANT Information is ENCOURAGED. 

Please nooOOOOOOoooo!

>
>                                   Robert E. McElwaine
>                                   B.S., Physics and Astronomy, UW-EC
                                    ^^^
              Ahhh...this explains it all.  KIBO strikes again! <sigh>
-- 
  Bob Billson, KC2WZ                          | internet: bob@kc2wz.bubble.org
  $nail:  21 Bates Way,  Westfield, NJ 07090  | uucp:     ...!uunet!kc2wz!bob

  "Professional ear piercing--while you wait!"  --sign in local jewelry store
Newsgroups: sci.astro,sci.geo.meteorology,rec.radio.amateur.misc,rec.radio.shortwave
From: oler@rho.uleth.ca (Cary Oler)
Subject: AURORA WATCH: Middle Latitude Auroral Activity Watch
Organization: University of Lethbridge
Date:  9 Oct 92 21:07:30 GMT

                /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

                    MIDDLE LATITUDE AURORAL ACTIVITY WATCH

                         ISSUED: 20:45 UT, 09 OCTOBER

                /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

VALID UNTIL: 19:00 UTC ON 11 OCTOBER

MODERATE RISK PERIOD: 09 - 10 OCTOBER (UT days)

POTENTIAL MAGNITUDE OF MIDDLE LATITUDE AURORAL ACTIVITY:  LOW TO MODERATE

POTENTIAL LUNAR INTERFERENCE:  HIGH

OVERALL OPPORTUNITY FOR OBSERVATIONS FROM MIDDLE LATITUDES:  FAIR - POOR

AURORAL ACTIVITY MAY BE OBSERVED APPROXIMATELY NORTH OF A LINE FROM...

        SOUTHERN BRITISH COLUMBIA TO MONTANA TO NORTH DAKOTA AND POSSIBLY
        PARTS OF SOUTH DAKOTA TO MINNESOTA TO WISCONSIN TO MICHIGAN TO
        NORTHERN NEW YORK STATE TO SOUTHERN MAINE.


SYNOPSIS...

     Auroral activity has become enhanced over the last 24 hours due to the
     arrival of two minor interplanetary disturbances.  Activity is expected
     to remain modestly enhanced over the next 24 to 48 hours.  Conditions
     may become sporadically favorable for observations of activity over the
     middle latitudes during the local evening and early morning hours of
     09/10 October.  Lunar phase will inhibit the visibility of activity.
     This is not expected to be a particularly impressive period of auroral
     activity.

     This WATCH will remain active until 19:00 UT on 11 October when it
     will either be updated or allowed to expire.


**  End of Watch  **
From: collins@emperor.gatech.edu (Tom Collins)
Newsgroups: sci.astro
Subject: Re: Fireball, Meteorite
Date: 13 Oct 92 13:36:21 GMT
Distribution: na
Organization: CERL-EE, Georgia Institute of Technology

In article <92287.102734K3032E0@ALIJKU11.BITNET> K3032E0@ALIJKU11.BITNET (Herbert Raab) writes:
>I saw a picture of the car that was hit by the meteorite last Friday in an
>Austrian (|) newspaper. They said that the meteor was videotaped by a TV-
>station, so the "brigt green meteor" was probably caused by this piece of rock
>coming in. Can somebody confirm this?
>
>They also wrote that a meteorologist (|) said the meteor was part of a shower
>which is observed each year on October 9. I doubt this, because until now none
>of the known meteor-showers delivered a meteorite.
>

Ignoring for the present the ongoing argument about the temperature of the
alleged meteorite and therefore its authenticity, it would certainly appear
that the fireball sightings correspond with landfall of a fragment in
New York (where the car was hit).

For example, various reports describe the fireball as
 - in the northern sky, seen from the C&O canal in Maryland
 - headed north or northwest, from an independent sighting in Maryland
 - headed north, various sightings from the Carolinas to NY.

These same observations, as others have already noted, tend to confirm 
that the fireball was NOT part of a shower.



-- 
Tom Collins                               tom.collins@ee.gatech.edu
Georgia Institute of Technology           (404) 894-2509
400 Tenth St. NW, CRB 384
Atlanta, GA  30332-0540
From: sichase@csa1.lbl.gov (SCOTT I CHASE)
Newsgroups: sci.astro
Subject: Re: THE TRUE CAUSE & ORIGIN OF EARTHQUAKES
Date: 15 Oct 1992 11:52 PST
Organization: Lawrence Berkeley Laboratory - Berkeley, CA, USA
Distribution: world
NNTP-Posting-Host: 128.3.254.196
News-Software: VAX/VMS VNEWS 1.41    

In article <1992Oct15.160734.29699@organpipe.uug.arizona.edu>, apoyner@as.arizona.edu writes...
>Have you ever NOTICED that the more UNBELIEVABLE or PREPOSTEROUS an
>article is, the more USE the author makes of CAPITALIZATION?

On sci.physics, John Baez has established a crackpot index.  I believe that
you get a 5 point hit for every inappropriately capitalized word.  Several
posters have hit the 400-500 range primarily due to abuse of caps.

If you folks think *you* have problems, you should check out sci.physics.  
There are half a dozen guys lately who are convinced that they have
revolutionized quantum mechanics, nuclear physics, or even all of physics.
They march boldly on where others fear to tread, traveling faster than 
the speed of light, revealing the secrets of biological transmutations
and antigravity, etc., sacrificing themselves to the inevitable persecution
(just like Galileo!) which results when you try to reveal the TRUTH in
spite of the attempts of scientists to protect the priesthood by suppressing
the truth about nature.  We do this, I am told, by obscuring the truth
with FANCY mathematics or refusing to ackowledge that our PRINCIPLES OF 
IMPOTENCE are just excuses for our failures, etc.

-Scott
--------------------
Scott I. Chase			"It is not a simple life to be a single cell,
SICHASE@CSA2.LBL.GOV		 although I have no right to say so, having
				 been a single cell so long ago myself that I 
				 have no memory at all of that stage of my 
				 life." - Lewis Thomas
Xref: sparky sci.astro:10781 sci.space:14466
From: gsh7w@fermi.clas.Virginia.EDU (Greg Hennessy)
Newsgroups: sci.astro,sci.space
Subject: Re: Diesen sphere or Strungen Sphere
Date: 14 Oct 92 18:18:11 GMT
Article-I.D.: murdoch.1992Oct14.181811.29168
Organization: University of Virginia

Henry Spencer writes:
#Use the outside, not the inside.  Arranging indirect lighting is left
#as an exercise for the student. :-)

Oh, in that case you get the gravitational field of the star at
whatever radius you build the SAS thing.

--
-Greg Hennessy, University of Virginia
 USPS Mail:     Astronomy Department, Charlottesville, VA 22903-2475 USA
 Internet:      gsh7w@virginia.edu  
 UUCP:		...!uunet!virginia!gsh7w
From: calloway@hplvec.LVLD.HP.COM (Frank Calloway)
Date: Tue, 13 Oct 1992 12:57:26 GMT
Subject: Re: Celestron C5 is back!
Organization: Hewlett-Packard Co., Loveland, CO
Newsgroups: sci.astro

The Celestron 5 is *almost* back.  The original C5s had a dual-arm
fork and the new C5s have a single-arm fork.  Thus, I'd expect the 
old mount to be steadier.

Frank Calloway
Newsgroups: sci.astro
From: gawne@stsci.edu
Subject: Re: Mars Observer and the "Face"
Organization: Space Telescope Science Institute
Distribution: na
Date: Mon, 12 Oct 1992 17:44:23 GMT

In article <1992Oct12.150056.9477@ryn.mro4.dec.com>, 
randolph@est.enet.dec.com (Tom Randolph) writes:

> Can someone at NASA post NASA's thoughts one way or another regarding the
> Mars Observer and the Martian "face"? 

Oh boy.  Along these lines, I've looked thru my Atlas of Mars trying to
find this "feature" without success.  Perhaps someone can point me to
a specific page and map?  Or did the face come from the same survey that
showed us the dinosaurs that resembled iguanas?

I've always pretty much assumed that the "face" represents a curious
combination of crater, interior features, and shadows.

-Bill Gawne,  Space Telescope Science Institute
Newsgroups: sci.astro
From: dsmith@hplabsz.hpl.hp.com (David R. Smith)
Subject: Re: The color violet?
Date: Mon, 12 Oct 1992 19:36:24 GMT
Distribution: na
Organization: Hewlett-Packard Laboratories Palo Alto,CA

In article <1992Sep30.191944.22528@engage.pko.dec.com> moroney@ramblr.enet.dec.com writes:
>BTW, I read somewhere the human retina does respond well into the ultraviolet
>yet the lens itself filters out the UV, so we don't "see" it.  But people
>who have artificial lenses do see UV.  Don't know how true this is.

True.  Indeed, in the November 1992 Sky & Telescope, Walter Scott Houston
writes (p. 583):

	I've received reports from amateurs noting the color of the Saturn
	nebula as light green, bluish green, and bright blue.  After a
	cataract operation some years ago my right eye's lens was replaced
	with a plastic insert that transmits ultraviolet light.  This eye
	sees NGC 7009 as brilliant blue, while the other eye -- its lens
	yellowing with age -- sees it as deep green.  I've noted similar
	color differences when looking at wildflowers, songbirds, and
	sunsets, and it adds to my longstanding suspicions about the colors
	of double stars reported by various observers throughout the years.

-- 
David R. Smith, HP Labs |   "I like to get my hands dirty,
dsmith@hpl.hp.com       |   because it stimulates my mind."
(415) 857-7898          |        -- Irwin Sobel
Organization: Johannes Kepler University Linz - Computing Center
Date: Thursday, 15 Oct 1992 10:23:57 CET
From: Herbert Raab <K3032E0@ALIJKU11.BITNET>
Newsgroups: sci.astro
Subject: Again: What makes Fireballs green


Sure enough, the forbidden lines of Oxygene are NOT responsible for the
green color. *Sorry*
But I do not think the composition of the meteoride is very important for
the color of the fireball. Meteors from Streams (coming from comets) should
have different colors than "ordinary" stony meteors or even irons, if that is
true.
By the way, copper is quite rare in meteorites, even in iron meteorites.
The light you see is mostly the ionized trail of the meteor in the upper
atmosphere, the glowing body itself is hardly (or probalbly not at all)
visible. So it's probably  OI emmisson...?

Greetings
  Herbert Raab
Newsgroups: sci.astro
From: mleech@bnr.ca (Marcus Leech)
Subject: Re: Radio Telescopes
Organization: Bell-Northern Research, Information Techology Division
Date: Thu, 15 Oct 1992 15:56:26 GMT

In article <1992Oct8.105453.10254@bsu-ucs.uucp>, 00csriggle@bsu-ucs.uucp writes:
|> Hi... Me and some other people are attempting to build a "minor" radio
|> telescope. Just wondering if anyone had ideas on whether to get a shortwave
|> from someone or to build one ourselves? If it's a good idea to buy one, is
|> there a good place to get one?
|> 
The only detectable-by-amateurs astronomical emmissions in the 
  "shortwave" region (1-30MHZ) are those from the Jupiter-Io system.  
  This system emits fairly broadband noise in the range 18-21MHZ.  
  A useful "starter" project (assuming you live in the country--
  detecting Jupiter-Io in the city is nearly impossible),
  is to build a full-wave loop antenna above a ground plane, and "aim" it
  at Jupiter.  You should be able to hear a rise in the general noise floor.

Other amateur radio astronomy projects in the VHF/UHF range are certainly
  possible, but require more work.  I run a mailing list out of
  radio-astro@cs.buffalo.edu that hasn't been active for over a year--its
  intended purpose is the discussion of amateur radio astronomy projects.

Building low-noise amplifiers using increasingly-cheap HEMT GaAsFETs is now
  entering the realm of achievability in an amateur context.  I recently
  purchased a pair of low-noise amplifiers for 1420MHZ with a measured noise
  temperature of 40K and a gain of 17dB. This certainly makes more exotic
  amateur radio astronomy projects viable.

-- 
Marcus Leech, 4Y11             Bell-Northern Research  |opinions expressed
mleech@bnr.ca                  P.O. Box 3511, Stn. C   |are my own, and not
ml@ve3mdl.ampr.org             Ottawa, ON, CAN K1Y 4H7 |necessarily BNRs
From: cam@syzygy.DIALix.oz.au (Cameron Newham)
Newsgroups: sci.astro
Subject: Mars Observer and the "Face"
Distribution: world
Date: Wed, 14 Oct 92 10:16:46 GMT
Organization: Baldrick Fan Club
Reply-To: cam@syzygy.DIALix.oz.au


In article <rabjab.37.718908076@golem.ucsd.edu> rabjab@golem.ucsd.edu writes:

 > I'm not from NASA, but it's my understanding that the cross-track pointing 
 > error of the hi-res camera is greater than the width of a swath (2.8 km).
 > This is due to uncertainty in the orbit.   The Mars Observer project
 > is not required to do precise pointing with the hi-res, though it certainly 
 > would be desireable.  Some effort may be made to use optical navigation
 > to improve the knowledge of the orbit so that certain critical images
 > can be acquired (i.e. imaging a Viking lander on the surface).  I
 > heard that an attempt to image the "face" would be made also.
 > 
 > ---------------------
 > rabjab@golem.ucsd.edu
 > 

What is the estimated resolution of the MO hires camera?  At first I was
suprised that they could image a Lander but thinking about it now, Orbiter
imaged a Surveyor on the Moon so I expect MO would do equally as well.


-------------------------------------------------------------------------------
| Cameron (The Master)    | "I find it hard to take seriously the opinion of  |
| cam@syzygy.DIALix.oz.au |  someone who puts a Star Trek: TNG quote in their |
| cam@adied.oz.au         |  .sig"     --  Richard J. Rauser                  |
-------------------------------------------------------------------------------

Newsgroups: sci.astro
From: fischer@physun.physics.mcmaster.ca (Phil Fischer)
Subject: Re: Diesen sphere or Strungen Sphere
Organization: Dept. of Physics & Astronomy, McMaster University
Date: Wed, 14 Oct 1992 03:20:45 GMT

In article <Bw0poC.E4z@Novell.COM> steve_olson@npd.novell.com writes:
>Does anyone know any thing about a Diesen sphere or a Strungen Sphere? 
>It is supposed to be a sphere with a star in the middle. 
>
>I first saw it on Star Trek, you should see it in this weeks episode, I saw 
>the sattelite feed on Sunday.  Our local university astronomer told me that
>the sphere is actually called the strungen sphere, but on ST they refer to
>it as a Diesen Sphere.
>
>Steveo
>


I believe he is referring to Dyson and Stromgren spheres. The Dyson sphere
is an artificial hollow sphere which surrounds a star. No Dyson spheres are
known to exist. A Stromgren sphere is a simplified model of an Hll region.
It is a sphere (to first order) of ionized gas surrounding one or many hot
young (forming or just formed) stars. 

-- 
Phil Fischer                         | Hamilton, Ont.
fischer@crocus.physics.mcmaster.ca   | Canada
Dept. of Physics and Astronomy       | L8S 4M1
McMaster University                  | 416-525-9140 X 4574
Newsgroups: sci.astro
From: asnd@erich.triumf.ca (Donald Arseneau)
Newsgroups: sci.astro
Subject: Re: University Optics Filter Wheel
Date: 15 Oct 1992 03:33 PDT
Organization: TRIUMF: Tri-University Meson Facility
Distribution: world
NNTP-Posting-Host: erich.triumf.ca
News-Software: VAX/VMS VNEWS 1.41    

In article <Bw5CG2.B4C@news.iastate.edu>, F1.DAO@isumvs.iastate.edu (David Oesper) writes...

>The real surprise comes when I rotate the filter wheel
>to the open (i.e. no filter) position.  Now the image is grossly out
>of focus!  I have to focus in the FAR direction relative to the red
>filter in-focus position to achieve focus.  

This is because the optical path length throught the filter is longer
than the same actual distance through air.  The "optical path length"
is just a way of accounting for light slowing down as it passes through 
a dense medium.  Assuming an index of refraction of 1.5, the optical 
path length of the filter is 1.5 times the actual thickness.  If your
filter is 2mm thick, removing the filter moves the focus back by
             1.5*2mm - 2mm = 1mm.
path length of filt - path length of air = displacement of focus.

Donald Arseneau       asnd@reg.triumf.ca
Newsgroups: sci.astro
From: chaloux@accordion.mitre.org (Dave Chaloux)
Subject: Bright Fireball seen on East Coast
Reply-To: chaloux@accordion.mitre.org (Dave Chaloux)
Organization: The MITRE Corporation, McLean, Va
Date: Tue, 13 Oct 1992 15:03:16 GMT

I was reading in bed on Friday Night, October 9th at about 7:50 p.m EDT.
Out of the corner of my eye I caught a very bright moving green glare.
I jumped out of bed and looked out the window. There was a very bright
green Fireball traveling from NW to the NNE. I would estimate that it
was only slightly less bright than the full moon and was perhaps
magnitude -11 to -13. How big it was depended upon exactly what part
you counted from but slightly smaller than the full moon is about right.
At peak elevation it was maybe 20-30 degrees above the horizon here
from just S of Washington D.C. Surprisingly, the train left by it was
fairly brief in longevity; just a few seconds. It was a Bolide with
bright orange streaks left by pieces coming off. At least one video tape
of it exists and was shown on Channel 4 news in Washington. There were
reports of it being seen as far S as North Carolina. Its speed was
relatively slow and I watched it for perhaps 5 seconds.

The Tuesday, Oct 13th issue of the Washinton Post on pg A7 mentions that
a meteorite hit a parked car in Peekskill N.Y. This is almost certainly
the same object. It is 11" by 4" by 5" and weighs about 20 pounds.
Peekskill is slightly E of N of N.Y. City and is about 400 miles N.E of
my location.

I was frankly surprised to hear they found it because I watched it
flame out above the horizon.

Some questions for those who know more about such than I do.

1) I have seen green meteors before but they are fairly rare. The ones
I have seen have always been bright. What causes the green. I know
copper has emission lines in the green but I wouldn't have thought
there would be enough copper in a meteor to cause it to give off green.
Another possibility might be that highly ionized oxygen has lines in the
green. Anybody actually know?

2) There was alot of speculation on the radio in my area that the
meteorite was part of the Draconid shower that peaked on October 8.25
UT. I find this unlikely for two reasons. A) I have heard that it is
very rare for meteor showers to produce meteorites. Almost all of the
material making up the showers is very fine. B) It doesn't seem to
match up with what I thought the path was. Can someone give me a
definitive answer on this yet?

3) Has an orbit for it been calculated yet? If so what was it?

I would appreciate any and all information about it that those in the
know might have. Thanks: Dave.
From: meier@Software.Mitel.COM (Rolf Meier)
Newsgroups: sci.astro
Subject: Re: recovering meteorites (was Re: Fireball, Meteorite)
Date: 14 Oct 92 17:32:12 GMT
Distribution: na
Organization: Mitel. Kanata (Ontario). Canada.

In article <1992Oct14.074824.10234@organpipe.uug.arizona.edu> rclark@lpl.arizona.edu (Richard Clark x4971) writes:

>What ever happened to the Prairie Network made famous by the recovery of
>the Lost City Meteorite? Not that its coverage extended to the Northeast

Cancelled a few years ago due to budget cuts at NRC.
Some articles lately in the RASC Journal about it.

Rolf

Newsgroups: sci.astro