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Instead, a black hole uses the power of gravity to pull things towards it. How do black holes form? When a large star runs out of fuel it can no longer support its heavy weight. The pressure from the star's massive layers of hydrogen press down forcing the star to get smaller and smaller and smaller.
Astronomers know of two flavors of black holes: stellar-mass, which are up to a few dozen times the mass of Earth's sun, and massive, which can be billions of times the sun's mass â nearly the mass of all the stars in the entire Milky Way galaxy.lack holes have gravitational pulls so powerful, nothing can escape, not even light. Astronomers began mulling over the possibility of black holes in 1783, and scientists used Einstein's theory of general relativity to predict black holes in 1916.