Is it possible to derive Lorentz transformations just by assuming that if two spaceships are moving away from each other with a constant speed, it is impossible for them to tell who is moving, even if they can exchange light signals. (speed of light is assumed to be a constant). It seems to me that is shoud be possible, but to my surprise I have never seen such a derivation
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I want to know what happens to the space a black hole crosses over as our galaxy travels through space.
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