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    Trouble understanding Symmetries

    I'm stumped on a question about symmetries: Imagine you and a friend are on two separate rocket ships. According to me - standing on spacestation Babylon 5 – the two of you are moving parallel to each other at a constant speed but in opposite directions. What test would you do to confirm that...
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    Quick Time Dilation Question

    I just had a quick question on time dilation that I'm stumped on. There are three observers: two are traveling on separate ships traveling close to the speed of light (their speeds are the same) in opposite directions parallel to each other. One observer is standing still on a space station...