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Continue to ChatThe key to proving that there's a black hole is showing that there's a tremendous amount of mass in a very small volume. And you can do that with the motions of stars. - Andrea M. Ghez from https://whatsmyquote.com/quote/the-key-to-proving-that-there-s-a-black-hole-is-showing-that-there-s-a-tremendous-amount-of-mass-in-a-very