Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!cbosgd!ihnp4!qantel!hplabs!sri-unix!Cramer%CSL60%ti-csl.csnet@CSNET-RELAY.ARPA From: Cramer%CSL60%ti-csl.csnet@CSNET-RELAY.ARPA Newsgroups: net.physics Subject: Re: Do Positrons Have Negative Mass? Message-ID: <552@sri-arpa.ARPA> Date: Wed, 18-Sep-85 07:01:00 EDT Article-I.D.: sri-arpa.552 Posted: Wed Sep 18 07:01:00 1985 Date-Received: Sat, 21-Sep-85 04:32:06 EDT Lines: 20 From: Nichael [Our system crashed during my first attempt to send this. Sorry, if you get this twice.] >>I've heard this before, but I don't understand how anyone can make this >>claim. How can we tell that Andromeda, say, is composed of matter and not >>anti-matter? What observational differences would there be between a matter >>galaxy and an anti-matter galaxy? The only difference between a particle The space between the Milky Way and Andromeda, while a REAL GOOD vacumn, is not a perfect vacumn, and so there would have to a matter/antimatter frontier somewhere. While I don't have any numbers for this it seems that the highly anisotropic distortions in the background radiation resulting from the matter/antimatter interactions should be easily observable. This radiation should have a clearly defined spectrum; a nice spike at ~1Mev, for instance. NLC ------- Brought to you by Super Global Mega Corp .com