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From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.physics
Subject: Re: speed
Message-ID: <11288@brl-tgr.ARPA>
Date: Mon, 17-Jun-85 18:59:22 EDT
Article-I.D.: brl-tgr.11288
Posted: Mon Jun 17 18:59:22 1985
Date-Received: Sun, 23-Jun-85 06:38:46 EDT
References: <359@osiris.UUCP> <56@rtp47.UUCP>, <11222@brl-tgr.ARPA> <1428@ecsvax.UUCP> <256@azure.UUCP>
Organization: Ballistic Research Lab
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> 	I wonder, can the twin who remains behind *really* be considered
> to be in an inertial reference frame?  After all, he is subject to the gravity
> of the earth.  Doesn't that make his reference frame non-inertial? 

The Earth has nothing to do with it.  Let the "home" twin remain free-
floating in space or something like that.  The twin paradox is entirely
special-relativistic.