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From: REM%IMSSS@SU-AI.ARPA (Robert Elton Maas)
Newsgroups: net.space
Subject: where are the aliens headed??
Message-ID: <8603210822.AA02367@s1-b.arpa>
Date: Fri, 21-Mar-86 03:43:24 EST
Article-I.D.: s1-b.8603210822.AA02367
Posted: Fri Mar 21 03:43:24 1986
Date-Received: Sat, 22-Mar-86 22:35:19 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 17

EV> Date: 14 Mar 86 22:44:24 GMT
EV> From: hplabs!qantel!lll-lcc!lll-crg!mordor!ut-sally!utastro!ethan@ucbvax.ber
keley.edu  (Ethan Vishniac)
 (I would send this to the author, but the UUCP path is so damn long...)
EV> Subject: detecting alien spacecraft
EV>        On the Detectability of Antimatter Propulsion Spacecraft
 (Detecting alian antimatter propulsion by NASA Gamma-Ray Observatory)
EV> In this paper Michael Harris points out that alien spacecraft using an
EV> antimatter drive will have large proper motions and be quite conspicuous.

You are omitting something very important. Hint: In military, if you
see an artillery shell with zero proper motion? Answer, run like hell
in any direction. Do I have to spell it out? (The proposed method will
fail to detect any alien craft that is headed directly for Earth, such
as an invading force, on its way to stamp out the society responsible
for Howdy Doody and the McCarthy hearings as well as everybody
involved in World War 2 on both sides.)