Black holes are objects which have gravitationally collapsed behind an Event horizon. A black hole is so massive that light cannot escape its gravitational pull. The disappearance of light and matter within a black hole may be thought of as their entering a region where all possible world lines point inwards. Stephen Hawking has predicted that Event horizon black holes can "leak" mass, a phenomenon called Hawking radiation, a quantum effect not in violation of general relativity. Numerous black hole candidates are known. These include the supermassive object associated with Sagittarius A* at the center of our galaxy.
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