Why do some galaxies have supermassive black holes at their centers?
Quick Answer
Gas inflows, mergers, and repeated feeding over cosmic time can build black holes millions or billions of times the Sun’s mass. Many large galaxies, including the Milky Way, seem to host one.
The Full Story
Most large galaxies appear to contain a central supermassive black hole, though their growth histories differ. In the early universe, dense gas could rapidly feed seed black holes, and galaxy mergers likely helped them grow even larger. As matter falls inward, it forms a hot accretion disk that can emit enormous amounts of energy, creating an active galactic nucleus or quasar. The Milky Way’s black hole, Sagittarius A*, has a mass of about 4 million Suns. In more extreme cases, central black holes can reach billions of solar masses.
Key Facts
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