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Stupendously large: How big can black holes get?
The discovery of ultramassive black holes has raised questions about how these celestial objects first formed in the Universe, how they can grow to such immense sizes.
This supermassive black hole is the beating heart of the Milky Way, driving the formation and evolution of our galaxy for its entire 13 billion-year-history, helping to give rise to solar systems like our own. "From a theoretical perspective, there's no limit," says James Nightingale, an observational cosmologist at Newcastle University in the UK, who in March 2024 discovered an ultramassive black hole that weighed in at 33 billion times the mass of the Sun. They must have been born relatively early in the Universe's history and then ferociously devoured materialWe cannot see black holes directly because of their very nature – at their boundary, known as the event horizon, gravity becomes so intense that nothing can escape, not even light.
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