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Q: Why does going fast or being lower make time slow down?
But if physics is the same for everybody, then the speed of light (hereafter “C”) must be the same for everybody. A good way to explore the connection is a “light clock”. A light clock is a pair of mirrors, a fixed distance apart, that bounce a photon back and forth and *clicks* at every bounce. The lower the slower: Less commonly known, is that the lower you are in a gravity well, the slower time passes. So the acceleration that pushes you down in a rocket does all the same things that the acceleration due to gravity does.
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