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From: art@ACC.ARPA
Newsgroups: net.space
Subject: Time Retardation
Message-ID: <8511111807.AA01976@s1-b.arpa>
Date: Sat, 9-Nov-85 17:49:00 EST
Article-I.D.: s1-b.8511111807.AA01976
Posted: Sat Nov  9 17:49:00 1985
Date-Received: Tue, 12-Nov-85 06:27:13 EST
Sender: daemon@ucbvax.BERKELEY.EDU
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Organization: The ARPA Internet
Lines: 20


> If someone travels at near light speed, isn't elapsed time for she/he
> less than the elapsed time for someone traveling at a much slower speed.

The difference in the rate at which time passes for two different inertial
frames of reference is determined by the Lorentz Transformation:

	     ---------
	    /    v**2		v = Velocity of one frame with respect to
	\  / 1 - ----			the other.
	 \/      c**2		c = Speed of light.

As one approaches the speed of light, the rate that time passes in one
frame of reference (like a spaceship) as "observed" from the other
(say on Earth) approaches zero.  Some thought on this leads to the classic
"Twin Paradox".  I'll let someone else point that solution out.

					"Art Berggreen"

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