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Speed of light
Something I never got was how this really works. If things are relative then how am I ever going a real speed at all? To the ground I may be moving 5mph but to a galaxy moving away from me I could somehow be moving faster than the speed of light. After all, if two bodies in space are both moving near the speed of light, away from each other... then relative to each other, how are they not moving faster than the speed of light?
Speed seems completely arbitrary under relativity.
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