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What are black holes?...

What are black holes?

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(i) Black holes are end stage of stars which are highly dense massive object.
(ii) Its mass ranges from 20 times mass of the sun to 1 million times mass of the sun.
(iii) It has very strong gravitational force such that no particle or even light can escape from it.
(iv) Black holes are the strongest source of gravitational waves.
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