Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site topaz.RUTGERS.EDU Path: utzoo!linus!philabs!cmcl2!seismo!columbia!topaz!Alfke.PASA From: Alfke.PASA@Xerox.ARPA Newsgroups: net.sf-lovers Subject: Re: Those inquisitive aliens Message-ID: <3187@topaz.RUTGERS.EDU> Date: Thu, 8-Aug-85 13:59:00 EDT Article-I.D.: topaz.3187 Posted: Thu Aug 8 13:59:00 1985 Date-Received: Sun, 11-Aug-85 04:33:51 EDT Sender: daemon@topaz.RUTGERS.EDU Organization: Rutgers Univ., New Brunswick, N.J. Lines: 16 From: Peter AlfkeDave Newman (Newman.pasa@Xerox) writes: >Any alien in the solar system will notice us on Earth!!! ... >It is very easy to see that something is >happening on Earth if you look at a night-time picture of North >America; you can identify most of the major population centers by >the size and approximate location of the blob of light that sits >there. From a low orbit (i.e. a LandSat satellite, from which we get those pretty pictures) only. From the distance of the moon, such features are invisible. In fact, ALL signs of civilization (except for radio emissions, of which enough has already been said) are invisible. --Peter Alfke