An ultramassive black hole is a black hole that has a mass of more than 10 billion times the mass of the sun. Black holes are regions of space where gravity is so strong that nothing, not even light, can escape. They are usually formed when massive stars collapse at the end of their life cycle.
Ultramassive black holes are rare and elusive, and their origins are unclear. Some scientists believe they were formed from the extreme merger of massive galaxies billions of years ago when the universe was still young.
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