A black hole is an area of space where gravity is so intense that nothing can escape it, not even light. When a big star collapses under the force of its own gravity, a singularity—a point of infinite density and zero volume—is created at the centre of the star.
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The event horizon is a region formed when the gravitational pull of a black hole causes the space and time continuum around it to bend. The event horizon is the line beyond which nothing, including light, can elude detection. The information contained in an object that has crossed the event horizon is effectively lost to the outside universe since it is locked inside the black hole.
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Black holes can vary in size. Black holes can vary in size. Stellar black holes, which have masses several times that of the Sun, are created from the remains of huge stars. On the other side, supermassive black holes are far bigger, with masses that are millions or even billions of times greater than the Sun. Most galaxies, including our own Milky Way, are assumed to have these supermassive black holes in their centres.
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Black holes are invisible, but their effects on adjacent matter and light can be used to infer their presence. For instance, when matter enters a black hole, it creates an accretion disc, which is a spinning disc of extremely hot gas and dust that produces powerful radiation before passing beyond the event horizon.