A black hole with a mass millions to billions of times that of the Sun, typically found at the centers of galaxies. These giants play a crucial role in galaxy formation and evolution through their gravitational influence and energetic feedback.
The term emerged in the 1960s-70s as astronomers discovered extremely luminous quasars and realized they required black holes far more massive than stellar remnants. 'Supermassive' distinguishes them from stellar-mass black holes, emphasizing their extraordinary scale.
Supermassive black holes are the puppet masters of galaxies - despite occupying less than 0.001% of a galaxy's volume, they control star formation across the entire galaxy through their powerful jets and radiation! The one in our galaxy is relatively quiet, but it could fit four million Suns inside its event horizon.
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