Question

What is black hole ?​

Answer 1

a black hole is a region of spacetime where gravity is show strong that nothing no particle of even electromagnetic radiation such as light can escape from it . the theory of general Relativity predicts that a sufficiently compact mass can deform space time to form a black hole.

Answer 2

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Intergalactic gas is so tenuous that it emits no light of its own. ... Instead astronomers study it indirectly by observing how it selectively absorbs the light coming from faraway sources known as quasars.

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