Supermassive Black Holes: Giants at Galactic Centers

Supermassive black holes weigh millions to billions of times more than the Sun.
They lurk at the centers of most large galaxies, including our Milky Way.
Sagittarius A*, the Milky Way’s central giant, is about 4 million solar masses.
The largest known supermassive black holes can reach over 40 billion solar masses.
They likely grew from smaller black holes, merging and feeding over billions of years.
When active, they power quasars and other luminous galactic cores.
Their immense gravity shapes how stars, gas, and galaxies evolve.
The Event Horizon Telescope imaged the shadow of one in galaxy M87 in 2019.
They may regulate star formation by blowing powerful jets and winds into their galaxies.
Unlocking their mysteries is key to understanding both galaxies and the fabric of the cosmos.