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What physical phenomenon is there that a black hole has a high gravity?

What physical phenomenon is there that a black holehas a high gravity?

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The supermassive black holes are all that remains of galaxies once all protons decay, but even these giants are not immortal. (Photo credit: Wikipedia)

Black holes and the LHC: A review (physicsforme.wordpress.com)
A Black Hole Brings New Stars To Life (forbes.com)
Astronomers put forward new theory on size of black holes (naturenplanet.com)

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