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Article #45Re: Smith-Tuttle Comet a threat to earth?
From: James Davis Nicoll
Date: Wed, 28 Oct 1992 02:28
Date: Wed, 28 Oct 1992 02:28
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In article <mcdonald.443@aries.scs.uiuc.edu>, mcdonald@aries.scs.uiuc.edu (J. D. McDonald) writes... >In article <STEINLY.92Oct26125854@topaz.ucsc.edu> steinly@topaz.ucsc.edu (Steinn Sigurdsson) writes: > > >>Speed relative to Earth is 50 km/s >Lord Almighty! 1/6 the speed of light!!!!!! ??????? Hmmm. That would make a lightyear about 63 AU, Alpha Centauri about 260 AU away, and light from the sun would take about 5 days to reach Earth. Earth orbits at 0.6 'C', and I *think* the sun should be a blackhole if C=50 km/s.... I think you're a tad low on the value of C.
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Newsgroups: sci.space Path: arc1-ca.pugleaf.net!sparky!uunet!utcsri!torn!watserv2.uwaterloo.ca!watdragon.uwaterloo.ca!watyew!jdnicoll From: jdnicoll@watyew.uwaterloo.ca (James Davis Nicoll) Subject: Re: Smith-Tuttle Comet a threat to earth? Message-ID: <Bwt87s.FMz@watdragon.uwaterloo.ca> Sender: news@watdragon.uwaterloo.ca (USENET News System) Organization: University of Waterloo References: <1754@tnc.UUCP> <1992Oct26.184231.1@cc.helsinki.fi> <STEINLY.92Oct26125854@topaz.ucsc.edu> <mcdonald.443@aries.scs.uiuc.edu> <27OCT199211351840@rigel.tamu.edu> Date: Wed, 28 Oct 1992 02:28:39 GMT Lines: 15