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From: carroll@uiucdcsb.CS.UIUC.EDU
Newsgroups: net.space
Subject: Re: Unified Field Theory - Time dil
Message-ID: <15700025@uiucdcsb>
Date: Tue, 12-Nov-85 16:20:00 EST
Article-I.D.: uiucdcsb.15700025
Posted: Tue Nov 12 16:20:00 1985
Date-Received: Thu, 14-Nov-85 00:46:59 EST
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Nf-From: uiucdcsb.CS.UIUC.EDU!carroll    Nov 12 15:20:00 1985


Not strictly true. You can travel at the speed of light, if you have
no "rest mass", e.g. a photon. As to traveling faster than light, your
time dilation becomes imaginary, and no one knows what that means.
The main argument against faster than light (FTL) is causality violations.
If you could get from place to place faster than light, you could send
messages back in time, because what is "now" is different for people who
are moving at different speeds. It is easy to create a situation with
three people, one saying "A happened before B", "B happened before A",
and "A and B were simultaneous".