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Astronomy · L4 · The Galactic Center and Sagittarius A*
How decades of stellar-orbit astrometry, Kepler's third law, a compactness argument, and general-relativistic tests established Sagittarius A* as a supermassive black hole.
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Astronomy · L4 · Weighing Sagittarius A*: stellar orbits at the Galactic Center
Note · Jul 27
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