PV Gap

Everett Said:

do you think time travel is possible?

We Answered:

What you've described in your assertion, is motion through time AND space. Time travel is just that...travel through time, travel through space need not be involved. So to make an assertion about time travel, you need to separate the space travel from the time travel. That is, time travel will be time travel regardless of where you are in space.

To answer your question...time travel as you imagine it is not possible. That is, I suspect, you are talking about traveling both forward and backward in time. There has been no evidence through experiment that anything can travel backward in time. In fact, travel through worm holes, for example, is just a wild imagination with no real basis in physics. Scifi stuff.

Even time travel into the future is improbable if not impossible. Relativity posits we could travel fast enough to slow our time down relative to the outside. Thus, when we returned from our trip, we'd find that we landed some time in the future from the time passed while traveling.

But, and this is a big BUT, the energy to accelerate to the velocities needed to make the travel into the future significant are beyond current and even predicted future capabilities. In the extreme, traveling at the speed of light, where time for the travelers stands still, would take an infinite amount of energy. Even the entire universe does not have an infinite amount of energy.