There's a good discussion here, especially in the first answer.

On Thu, Mar 28, 2019 at 7:14 AM David Shaw <xxxxxx@gmail.com> wrote:

I've been thinking - never a good sign. I understand that good old uncle Albert's theories state that FTL travel isn't possible, because - and I'm paraphrasing from memory here, so I could well be wrong - if you jump from A to B, some observer at C could see you arrive before you depart, leading to all sorts of nasty time-travel paradoxes.

However, imagine that I'm in a Type-A in orbit about Earth. At what point in space are the signals emitted and reflected by my ship attenuated to such a degree that they become indistinguishable from the background? Wouldn't this then alleviate the paradoxes provided I jumped at least twice that distance - so that from any given point in space I could be detected either departing or arriving but no observer could ever see me do both?

Or have I got that totally wrong? Am I just talking out of my rectal orifice?

David Shaw

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