[ExI] Time Travel and FTL flight

Ben Zaiboc ben at zaiboc.net
Fri Sep 3 19:07:25 UTC 2021

On 03/09/2021 18:11, Adrian Tymes wrote:
> The matter at hand was the objection that FTL always causes time 
> travel, which I believe is not a true claim.

What I was trying to say was, if FTL travel /can/ result in time-travel, 
then that means that FTL travel is not possible (on the premise that 
time-travel is not possible), not that it always does.

Unless, somehow, only non-time-travel-causing FTL journeys were possible 
(so your FTL drive mysteriously stops working when you try certain trips).

And yes, of course, when I say 'time-travel', I mean into the past. 
Travelling into the future, no matter how fast, causes no problems. Or 
does it? This vexing idea that there is no such thing as 'simultaneous' 
has got my head spinning. If you FTL travel to a far place that is in a 
different reference frame, where time is going at a different rate, then 
back again, can you have you travelled backward in time? I really don't 
know. Intuitively, it would seem you can't possibly arrive before you 
left, but ... ><


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