Biography of a Recluse

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Science  07 Jan 2000:
Vol. 287, Issue 5450, pp. 66
DOI: 10.1126/science.287.5450.66

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Where did Sagittarius A*, the black hole at the center of our galaxy, come from? The most plausible model, according to theorists, is that a huge gas cloud near the center of the young Milky Way collapsed under its own gravity, spawning a black hole.