tswarthog wrote...
Time travel can be done into the feature but not the past, if you were to approach the speed of light for an extended period of time you would be going slower than everyone else. If you were to build a track around the earth and have people going close to the speed of light around it for multiple years they would arrive into a feature time relative to the amount of time that has passed for them.
Travel to the past however is impossible because you could create a paradox.
Didn't Hawkins said that time travel is possible to the past, but since the future isn't written yet that if it was possible that the future you could travel to is only one of a billion possible futures. IE back to the future II.
I don't know where i read this at, but if you could travel in time that the energy needed to travel one day is equal to the energy of the sun.