Black holes form when massive stars exhaust their nuclear fuel and collapse under their own gravity. This collapse compresses the core into a singularity, an infinitely dense point surrounded by the event horizon. The three main types are stellar-mass black holes, which weigh between 1 and 100 times the Sun’s mass and form after a supernova; intermediate-mass black holes, with masses between 100 and 100,000 Suns, still poorly understood; and supermassive black holes, millions or billions of times the Sun’s mass, often found at the centre of galaxies, growing through mergers and the accretion of stars.
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