Which known black hole is the most massive?
Quick Answer
One of the most massive well-studied black holes is in the quasar TON 618, with an estimated mass of about 66 billion Suns. The exact value is uncertain, but it is far larger than the black hole in the Milky Way.
The Full Story
TON 618 is widely cited as hosting one of the most massive known black holes. Its mass is commonly estimated at about 66 billion times the mass of the Sun, though the number has some uncertainty because it is inferred from quasar properties. For comparison, Sagittarius A* at the center of the Milky Way is only about 4.3 million solar masses. TON 618 is not a nearby object; it is a distant quasar, so we observe the active galaxy around it rather than the black hole itself directly. Objects like this show how extreme black hole growth can become in the early universe.
Key Facts
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