Einstein wins again: Space satellite confirms weak equivalence principle


One of the most counter-intuitive notions in physics is that all objects fall at the same rate, regardless of mass, aka the equivalence principle. This was memorably illustrated in 1971 by NASA Apollo 15 astronaut David Scott during a moonwalk. He dropped a falcon feather and a hammer at the same time via a live television feed, and the two objects hit the dirt simultaneously. There's a long trad...

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