Say I get on a Sci-Fi speed Rocket Ship and leave Earth at .999999% the Speed of Light to me I travel for 21 minutes reach Mars then U-Turn back to Earth for another 21 minutes at 0.999999% the Speed of Light again. Back on Earth if I compared my watch to someone else’s would my watch be slightly ahead or slightly behind?
Like if I’m the one traveling I’d expect their watch to be slightly ahead of mine because slightly less time has passed. But at the same time from my frame of view. Earth and my bussy with the watch just shot away from me for 21 minutes and then returned and came back 21 minutes later so my watch should be ahead of theirs since they were the one traveling.
In: Physics
Both of you will agree on the time spent in flight. For the guy on earth he will see that you go super fast and your time ticks slow but for you on the spaceship it will feel that the path you are traveling ( earth – mars and back ), has shrunk and earth clock is ticking slow. See this video to for more clarification [https://www.youtube.com/watch?v=6MfJ59lkABY](https://www.youtube.com/watch?v=6MfJ59lkABY). You can also read about twin paradox as already stated in one of the comment.
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