There is a more profound puzzle underlying this spacetime confusion. People who live at altitude really do have more time, as do people who stay still Time shifts with both mass and velocity, to be different at every point in the universe: we live, Rovelli says, in a “spiderweb of time”. But everything in the universe is in motion everything feels gravity’s grasp. The difference as measured on an atomic clock is counted only in billionths of a second, and we on Earth can conveniently ignore this temporal untidiness. People who live at altitude really do have more time, as do people who stay still. In 1972, physicists sent a quartet of caesium clocks jetting around the planet in different directions to confirm Einstein’s special relativity. Forget about universal time, a simultaneous now across the cosmos.
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