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From: @S1-A.ARPA,@MIT-MC.ARPA:mcgeer%ucbkim@Berkeley
Newsgroups: net.space
Subject: Re:  Matter/Antimatter drive
Message-ID: <1996@mordor.UUCP>
Date: Thu, 30-May-85 13:22:54 EDT
Article-I.D.: mordor.1996
Posted: Thu May 30 13:22:54 1985
Date-Received: Sun, 2-Jun-85 07:26:33 EDT
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From: Rick McGeer <mcgeer%ucbkim@Berkeley>

	A collision of a particle with its antiparticle (say an electron with
a positron) produces two photons, with energy equal to the relativistic
kinetic energy of the particles, travelling on vectors normal to the vectors
of the particles.

	Thrust comes from the light pressure of the photons.

	As for manufacturing antimatter, we do it *now*.  Positron Emission
Tomography (PET) works by shooting positrons and electrons into the material
you want to photograph.

						Rick.