What is black hole?
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A black hole is a region of space where the gravitational field is so strong that nothing, not even light, can escape from it. It is created by the collapse of a massive star when it can no longer produce enough energy to counteract the force of its own gravity. The boundary around a black hole beyond which nothing can escape is known as the event horizon. Once an object crosses the event horizon, it is thought to be lost forever in the singularity, the infinitely dense point at the center of the black hole. Black holes are fascinating objects of study in astrophysics and are believed to play an essential role in the evolution and formation of galaxies.