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*To*: starship-design@lists.uoregon.edu*Subject*: Re: starship-design: FTL and time travel*From*: Steve VanDevender <stevev@efn.org>*Date*: Thu, 28 Aug 1997 15:13:18 -0700*In-Reply-To*: <340602AC.1C46@sunherald.infi.net>*References*: <9708282030.AA17235@bit.csc.lsu.edu><340602AC.1C46@sunherald.infi.net>*Reply-To*: Steve VanDevender <stevev@efn.org>*Sender*: owner-starship-design

Kyle R. Mcallister writes: > Actually, the speed of light is not constant in a vacuum, but can be > sped up...its too in depth to post, but it happens in a casimir cavity. > Ask Steve, he knows more. Don't even try to make it look like I'll support you on this, Kyle, because I won't. I don't think you know enough about the Casimir effect to explain why it changes the speed of light, and I don't think you can justify any sort of useful FTL effect based on it. I won't argue such a thing, nor will I claim to know enough about the Casimir effect to try to explain it to anyone. > > >Unanswered question: If I travel 1600 light years in 2 years earth time, > > >how far back in time do I travel upon return? > > > > It depends upon how much you accelerate away (sublight) from Earth > > before returning. > > Lets say I navigate around the star system 1600 lightyears away for, say > 5 years, and return to earth in 2 years earthtime. Is there an equation > for this? > > Question: How do we know time runs backwards in FTL? Then again, how do > we know time runs forward here... It isn't that time runs backward in FTL, it's that observers of a hypothetical FTL trip won't agree on the direction that it proceeded based on their measurements of the times and locations of each end of the trip.

**Follow-Ups**:**Re: starship-design: FTL and time travel***From:*"Kyle R. Mcallister" <stk@sunherald.infi.net>

**References**:**Re: starship-design: FTL and time travel***From:*kuo@bit.csc.lsu.edu (Isaac Kuo)

**Re: starship-design: FTL and time travel***From:*"Kyle R. Mcallister" <stk@sunherald.infi.net>

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