Abstract
Abstract A black hole is a region of space where the force of gravity is so strong that nothing, not even light, can travel fast enough to escape from its interior. ‘What is a black hole?’ outlines how they were first conceived by theoretical physicists such as John Michell, Henry Cavendish, Pierre-Simon Laplace, and Albert Einstein, and explains the concepts of singularity, escape velocity, the event horizon, and spacetime. Black holes have now been identified in the Universe in their hundreds and accounted for in their millions. Although invisible, these objects interact with and influence their surroundings in different ways depending on proximity relative to the black hole.
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