Sci. Am had a special section on this a while back. (July 2000) My favorite arguemnt involves assuming that a tehcnoogocial species arises, sends one colony ship out at 0.1 c, it takes 400 years for that colonoy to send out another ship, etc. Making these estimates, the entire galaxy should be colonized in about 5 million years, whihc is a blink of the eye in cosmic terms. So where are they? You then get into "intelligent but no tech", deliberately avoiding us, etc. A good read if you like this stuff.
Steven Desjardins Department of Chemistry Washington and Lee University Lexington, VA 24450 (540) 458-8873 FAX: (540) 458-8878 [EMAIL PROTECTED]
