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From: carroll@uiucdcsb.CS.UIUC.EDU
Newsgroups: net.space
Subject: Re: Unified Field Theory and space trav
Message-ID: <15700030@uiucdcsb>
Date: Sat, 16-Nov-85 19:38:00 EST
Article-I.D.: uiucdcsb.15700030
Posted: Sat Nov 16 19:38:00 1985
Date-Received: Mon, 18-Nov-85 06:26:54 EST
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Nf-From: uiucdcsb.CS.UIUC.EDU!carroll    Nov 16 18:38:00 1985


They see the same thing as the equations describe, if you assume that they
don't spend much of their time accelerating. Each sees the other as "running"
slower than he is, based on their relative velocity (which would be twice that
of a "stationary" observer). You may say, "Wait, that's not possible. They
can't both see the other as running slower", but it is, if you realize that
there is NO universal "present". The "present" for each of the twins has
is different in different regions of space. The only time people can agree
on what time it is is when they are both in the same inertial frame, i.e.
at rest with respect to each other and not-accelerating. There is a good book
by Einstein about this, I will try to find the name of it, but I think it's
just entitled "Relativity".
	Please note: There are two theories of relativity. The Special case
deals only with relative motion in inertail frames (non-accelerating (so
called "inertial" because Newton's laws (of inertia) are accurate in one)).
General Relativity deals with acceleration, gravity, and other things, but
is widely complex. (In fact, my friend the physics major tells me that it
has only been tested to first order approximations, because the effects are
hard to compute and very hard to test).