The 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. The way the star moves around the center of the galaxy is very much like the way the planets orbit the sun.
I don't golf. I've never golfed. I will never golf.
I don't relax. My main relaxation is meeting illustrators and publishers in restaurants and bars.
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