I'm writing a sci-fi novel and I want it to be well founded in science but I'm a bit confused about time travel vs distance travel. Some have said that to travel great distances is really time travel. S, I'm just trying to make sense of all this.
I realize that the light I would see would be relative to the distance from my previous location and in some cases would be light that originated at different times and hence the universe would appear very differently from my previous location. But that doesn't seem like time travel to me (as others have stated here: Could an astronaut find their bearings in the Universe after being transported 6 gigalightyears from Earth?). From my new location, the light coming from earth might only show the earth when it was a fiery hell world, but that is old light. Equating traveling through space with time travel is like saying there is no concurrent anything. Just because I'm looking at very old light, doesn't mean that what I see is the current state, and that current state would exist in the same now that I exist in, even if I can't see it because light takes time to travel. In my world, the characters would be able to talk in real time through a worm hole but that assumes that they have not traveled in time.