u/Bubatz_Bruder

hey,

Every day here are some new questions about FTL travel and the problems that appear with physics.

Now i got a one as a physics noob about the paradox FTL travel would cause. I dont umderstand it.

Why would it cause a problem with causality?

Lets suggest we got a way to "teleport" within 1 minute to a planet 10 lightyears away. When we start it is Galactic Time = x.

We see the light of the targeted star system at x - 10 years.

Now we travel and arrive at x + 1 minute. Our arrivel would be (theoretical) visible at x + 10 year.

Why would this cause a paradox? How could we influence things in the past? I get we could get information faster than light, because we could trave back and share what we observed before this information would reach us the "normal" way, but why is that a problem?

I see it more than a spoiler for an show before it is aired. The show is still produced, we cant change the outcome just because we know what happens before it is broadcasted.