Black hole
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A black hole is a region in space with extremely intense gravitational pull, so strong that nothing, not even light, can escape its grasp once it passes a point called the event horizon. Black holes form when massive stars collapse under their own gravitational pull. The collapsed core of the star, known as a singularity, has infinite density and a gravitational force so strong that it warps space-time around it. Black holes are considered to be one of the most mysterious and bizarre objects in the universe. They have been observed indirectly through their effect on nearby matter and light, but their actual physical characteristics remain largely unknown.