Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from beak.andrew.cmu.edu via trymail for +dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl@andrew.cmu.edu (->+dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl) (->ota+space.digests) ID ; Mon, 23 Apr 90 02:12:02 -0400 (EDT) Message-ID: Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Mon, 23 Apr 90 02:11:33 -0400 (EDT) Subject: SPACE Digest V11 #306 SPACE Digest Volume 11 : Issue 306 Today's Topics: Re: Fermi paradox Re: Drake Equation (was Re: Interstellar travel) ---------------------------------------------------------------------- Date: 22 Apr 90 19:51:28 GMT From: convex!schumach@uunet.uu.net (Richard A. Schumacher) Subject: Re: Fermi paradox Of course the simplest answer is that They don't exist. Consider recent computer simulations of impactors on earth-sized bodies. Most planets that would have been earthlike either end up like Venus (too few/too small impacts) or Mars (too many impacts): they have the wrong kinds of atmospheres to evolve organic life. Earth may well be unique in this galaxy. ------------------------------ Date: 22 Apr 90 16:50:26 GMT From: rochester!dietz@rutgers.edu (Paul Dietz) Subject: Re: Drake Equation (was Re: Interstellar travel) > The electron density of the solar wind is roughly around 10^6 m^-3; of > interstellar space, perhaps 10^4-10^-6 m^-3. ^^^^^ I meant 10^6 m^-3. Paul F. Dietz dietz@cs.rochester.edu ------------------------------ End of SPACE Digest V11 #306 *******************