4 ms·
That...doesn't make sense. Let's say your spaceship can go to Jupiter in one second (Edit: as measured from Earth), which would require FTL speed. Then you tu
by diggernet 6y ago
That...doesn't make sense.
Let's say your spaceship can go to Jupiter in one second (Edit: as measured from Earth), which would require FTL speed. Then you turn around and come back. You've still arrived two seconds after you left.
At Jupiter, you could look through a super-telescope and see yourself still on Earth, but you still aren't really seeing yourself, because you are not still on Earth. You are just seeing the photons you passed during the trip, catching up to you.
- jfengel 6y agoYeah, it doesn't make sense because it's not correct. FTL enables a kind of time travel that isn't going back in time to shake your own hand. It allows two people in two different reference frames to disagree about whether A caused B or B caused A. You don't get to go "back in time" but you can send somebody lottery results before they're drawn (from somebody's perspective).
- akvadrako 6y ago> FTL enables a kind of time travel that isn't going back in time to shake your own hand. That is exactly what it is. You should read the links above to understand what's being claimed.
- diggernet 6y agoThe links discuss FTL communication implying communicating through time. I haven't taken the time to fully understand the arguments, so for the sake of this discussion I'm willing to simply assume that their conclusions are correct. Now... Please explain to me how communicating through time will allow you to literally, physically, shake your own hand as was claimed.
- akvadrako 6y agoIt's the same argument, just instead of assuming one can send information FTL, one can send matter. Or you assume a teleporter exists.