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*To*: "'LIT Starship Design Group'" <starship-design@lists.uoregon.edu>*Subject*: RE: starship-design: FTL*From*: "L. Parker" <lparker@cacaphony.net>*Date*: Mon, 25 Aug 1997 20:28:54 -0500*Encoding*: 27 TEXT*Reply-To*: "L. Parker" <lparker@cacaphony.net>*Sender*: owner-starship-design

[Kyle] I have a question (don't I always?): If you dissapear from orbit above earth, and later on reappear in orbit of tau ceti I, is causality violated? If so, why? No one saw you. Kyle Mcallister [L. Parker] Kyle poses a rather interesting question which I am going to expand a little for the sake of clarity: If you can move from here to there instantaneously, or nearly instantaneously, is causality violated? If you go from here to Tau Ceti in 1 second of real time, you don't arrive at Tau Ceti 11 years ago you arrive at t+1 sec. There is no FTL communication that I can see and no causality violation. Now expanding on this theme and ignoring everything except relativity for the moment, there would seem to also be a point or factor if you will beyond c at which causality is violated but only if you exceed that factor. That point would seem to be 2c - the speed which would put you at your destination at exactly t+0. Delta t for this trip would be -1 putting your arrival at any destination at exactly the point necessary to produce a causality violation. Am I being to simplistic here, or does this adequately describe causality? If so, then time travel isn't necessarily impossible, just USEFUL time travel. Lee

**Follow-Ups**:**RE: starship-design: FTL***From:*Steve VanDevender <stevev@efn.org>

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