Path: utzoo!attcan!uunet!husc6!rutgers!rochester!cornell!dietz From: dietz@loki.cs.cornell.edu (Paul F. Dietz) Newsgroups: sci.space Subject: Re: Cometesimals Summary: Correction Message-ID: <18262@cornell.UUCP> Date: 13 Jun 88 19:01:07 GMT References: <880608203735.21400546@Iowa> <18206@cornell.UUCP> Sender: nobody@cornell.UUCP Reply-To: dietz@loki (Paul F. Dietz) Organization: Cornell Univ. CS Dept, Ithaca NY Lines: 13 In article <18206@cornell.UUCP> dietz@loki (Paul F. Dietz) writes: > Frank et. al. estimate a density of about 3e-12 cometesimals per > cubic kilometer. Travelling at 20 km/sec, the flux of comets > near the earth would be something like 6e-11 per square kilometer > per second. A ten square kilometer powersat would be hit once > every fifty years, on average. Correction: 3e-11 per km^3, and 10 km/sec, not 20. So the powersat is hit once every ten years, on average, if the cometesimals exist. Paul F. Dietz dietz@gvax.cs.cornell.edu