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Science 7 January 2000:
Vol. 287. no. 5450, p. 66
DOI: 10.1126/science.287.5450.66
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Biography of a Recluse

Erik Stokstad

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.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)