I wondered uses KSP to a theory that if you go faster time to go more slowly. . For example, consider two persons, A and B. A goes to space flight, and when he comes back years later he is in time half a year ahead, kuntaas leftover Earth Surface B's time is gone the year ahead. The time difference is really not that great at all times but it still can be found. The matter has been tested by sending a clock into space and when it comes back to is compared to the time difference. What you guys think about this?