Which black hole has the largest known event horizon diameter?
Quick Answer
Among the largest known black holes, TON 618 is often cited as one of the most massive, with an estimated mass of tens of billions of Suns. A larger mass means a larger event horizon.
The Full Story
TON 618 is one of the most massive black holes known and is often used as a benchmark for extreme black-hole growth. Estimates place its mass at around 66 billion solar masses, though such values are inherently uncertain. Because a black hole’s event horizon scales with mass, this gives it one of the largest known horizons. TON 618 is a quasar, meaning it is actively feeding on surrounding matter and shining very brightly because of the hot accretion disk around it.
Key Facts
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Suggested video title for this topic:
"This quasar hides one of the most enormous black holes ever inferred."