Final answer:
A black hole is formed from the remnants of a supernova with intense gravity that even light cannot escape. Evidence for their existence is based on their effects on surrounding objects and radiation leakage.
Explanation:
A black hole is an object created when a star collapses to a size so small that even light cannot escape due to strong spacetime curvature. It is formed from the remnants of a supernova and has such intense gravity that it tears matter from nearby stars, emitting observable light and X-rays. Evidence for black holes' existence is supported by the effect they have on surrounding objects and the leakage of radiation around their edges.
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