A twin who makes a long trip at relativistic speeds returns younger than his stay-at-home twin sister.?

Question

Could he return before his twin sister was born? Defend your answer.

Answer 1

NO

The traveling twin is younger because she ages SLOWER, neither twin has stopped aging. Both twins are moving forward through time.

Now if you have a black hole rotating around a point and were somehow able to survive the stress of traveling so near a black hole, you could go through the stressed space and time travel would be possible. In this case the only limit is the existence of the black hole and the stressed space field itself. We also don't have any way of controlling the time travel or getting back to our original time line.

Then there is the theory of divergent development where a new time line is created for ever possible decision so that all possibilities exist in parallel. If this is true then it would be near impossible to return to your original time line.

Traveling near the speed of light, a relativistic speed, won't let your travel back in time, it will only slow the passage of time to you; the observer. To the person staying at home and moving at a slower speed time will seem to travel more quickly. So the stay at home twin will age faster, but the faster traveling twin won't go back in time unless they leave relativistic space.

Answer 2

Not unless he could make the universe spin in reverse. And everyone knows that only Superman could do that. And he didn't have a twin sister (unless I haven't read that comic).

No matter how fast you go, until you break the speed of light you will never be able to go backward in time. Since no one knows exactly what happens when and if you break the speed of light, it is possible that some kind of wormhole effect could take you back in time. The thing is that the universe doesn't really work that way. As strange as this universe is, it still has a tendency to keep objects in the state that they're decaying in. It is likely that a conscious being interacting with sub-atomic particles would actually create a past that was much different from our own. In that case, he could go back to before his sister was born and find out that he's actually a carrot.

Answer 3

no he cannot because its not that he was growing younger it was that his twin sister was aging faster than he was
since space and time are relative as you start to go fast and start the catch up to the speed of light your biological clock starts to slow down so since she was at rest she was aging normally and he was going faster he was aging slower which would make him younger than she is now