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I am confused about these facts:

1) If an observer A at rest relative to a moving spacecraft sees an event e1 in the space craft and measures the time interval to be t

_{1}on his clock and t

_{2}on the clock in the spacecraft.... if the observer B in the space craft sees this event and measures it as t

_{3}on his clock and as t

_{4}on A's clock...how are the different times connected?

2) in the case of muons travelling more distance than they are supposed to, the time we measure as their half life on the clock with us is supposed to be the dilated time and their true half life is the one measured by an observer on the muon frame in his clock...is this right??

3) if two very precise clocks are synchronized and one is kept at rest on the earth and the other is taken on a voyage and finally are brought together..Will the times be still different ??if yes ,why does this happen??

Are the clocks relevant in this discussion?

please explain this in a simple way(without world line diagrams)