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From: jlm@uvacs.UUCP (Jerrold L. Marco)
Newsgroups: net.space
Subject: Re: Re:  Tenth planet
Message-ID: <85@uvacs.UUCP>
Date: Mon, 6-Jan-86 17:05:59 EST
Article-I.D.: uvacs.85
Posted: Mon Jan  6 17:05:59 1986
Date-Received: Thu, 9-Jan-86 05:57:09 EST
References: <>, <923@nmtvax.UUCP> <6258@utzoo.UUCP>
Organization: U.Va. CS dept.  Charlottesville, VA
Lines: 13

> extinctions are caused by near approaches of a companion star, which is in a
> *very* long-period orbit [30MY or so], stirring up the Oort cloud and causing
> a rain of comets into the inner Solar System.)
> 
Question:  Wouldn't a massive rain of comets leave evidence on all the
inner planets?  My recollection is that on the moon, which has been reasonably
well charted, evidence of recent bombardment is scarce.  Can someone with
more knowledge than I comment on the corellation between the times of
mass extinctions on earth and the estimated times of comet strikes on the
moon (or on other inner planets, to the extent that such information is
available)?

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