[ExI] Time Travel and FTL flight

Giulio Prisco giulio at gmail.com
Sat Sep 4 05:32:38 UTC 2021

On Thu, Sep 2, 2021 at 11:25 PM Ben Zaiboc via extropy-chat
<extropy-chat at lists.extropy.org> wrote:
> On Thu, 2 Sept 2021 at 18:02, Adrian Tymes via extropy-chat
> <extropy-chat at lists.extropy.org> wrote:
> >
> <snip>
> > But clearly it is not time travel
> So Adrian, are you saying that FTL flight wouldn't involve time-travel?

Einstein's special relativity says that If you travel FTL, some
legitimate observers would see you arriving before leaving. Therefore,
according to many scientists, you can't travel faster than light.

Quantum entanglement doesn't seem limited by the speed of light
(experimental fact) but many scientists are persuaded that quantum
entanglement can't be used to send signals (or things, or people) FTL.

There are examples of paradox-free time travel to the past.

Time will tell. I guess both FTL travel and time travel to the past
will be possible at some point. We are still babies in the universe.

> I thought that under certain circumstances it would (specifically FTL travel to a location that was accelerating away at a significant rate relative to the point of departure, then FTL return. I think). Or is there no problem, and it's just the simple fact that nothing with mass can travel at, or faster than, light-speed that stops us being able to do it? (and tricks like Acubierre Drive, if it could exist, would work without causing paradoxes)?
> Ben
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Giulio Prisco
Writer, futurist, sometime philosopher. Author of:
Tales of the Turing Church
Futurist spaceflight meditations

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