Sabine is interesting, and I have listened to her before.
How I miss Art Bell.
I remember reading a book by Poul Anderson a very long time ago I think it was called tau zero
in the story they never got past light speed but they knowingly destroyed the universe but still survived till the next.
if you were to move faster than light I believe you might go backwards in time, the problem is that sucks for a lot of reasons, not the least of which is that you are also displaced in space as some proportion to a square of the time.
She also discusses time trav in the vid.
At speed of light, how would one develop a collision avoidance system to not crash into meteors and other space objects?