Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site petrus.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!bellcore!petrus!mwg
From: mwg@petrus.UUCP (Mark Garrett)
Newsgroups: net.physics,net.sci,net.philosophy
Subject: Re: A Sane Man Proposes A Time Travel Experiment
Message-ID: <243@petrus.UUCP>
Date: Thu, 31-Jul-86 15:33:46 EDT
Article-I.D.: petrus.243
Posted: Thu Jul 31 15:33:46 1986
Date-Received: Sat, 2-Aug-86 05:15:46 EDT
References: <289@axiom.UUCP> <5723@lanl.ARPA>
Organization: Bell Communications Research, Inc
Lines: 19
Xref: watmath net.physics:4717 net.sci:1418 net.philosophy:6396

++
> > [...suggests a time travel experiment...]
> > 	>< ...{ decvax!linus | seismo!harvard }!axiom!gts
>   
> There are a lot of good arguments against the possibility of time travel...
> Consider
> transporting a 1Kg cube of gold 1 hour back in time.  Then in the universe
> of 1 hour ago, there is this extra 1Kg from nowhere, totally unaccounted
> for.  Similarly in the here and now, we lost 1Kg of mass, poof, just like
> that.  Mass wasn't conserved in our universe.
> Doug Miller   

Actually that brings to mind an interesting point.  Mass *is* conserved
but only in the long run:  Since you brought the Kg back in time you
had *two* for an hour.  Then when you send one of them back in time,
you are still left with one!  If this were possible it would imply that
you can duplicate anything but only for finite periods of time.

-Mark Garrett