# Thread: time travel using gravity

1. my teacher keeps asking odd questions. how could a superhero with gravity powers use those powers to travel through time? time-space wormholes? how woul it actually be achieved?

2.

3. Which hero does he mean? Superman in the 60's? His physical powers then were gravity based which was nonsense since he would have had to have been born on a neutron star to be as strong as he was. He had adventures in other times.

Time travel is SF. For it to work, a universe would have to exist for every moment which you can travel to. If you could pick a single nanosecond, that would be Z billion x 365 x 24 x 3600 x 1,000,000,000 universes would exist with a billion more every second, and it would be like we were a moving picture from a cine projector, with NOW being where we were on the film at the present moment.

I used Z billion instead of 13.7 billion because at any point in future time to the end of everything, there is a past and a being from that time could travel back so if the end is 700 billion years after the BB, then z = 700 billion.

Worm holes use incredible amounts of energy, as in if one existed inside a black hole, it would probably be just yards long. The Star Trek wormholes are just not possible. If however there was a "subspace" where another universe occupied the same area as ours but was only one millionth of the size of our universe, then if you could travel into it, a rocket travelling at 25,000 mph there would cover 25 billion miles every hour here, once it emerged back into our space.

A good teacher if he makes his students think rather than just gives them text book quotes.

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