Question

how dense is a black hole?​

Answer 1

Answer:

The theoretical density of a black hole depends on how big it is and how you define its size. The density at the center of a black hole is infinite (it's a famous "singularity", which leads to difficulties in modern cosmology). g/cm3 for Aerogels and up to the heaviest substance, osmium, with a density of 22.61 g/cm3.

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Answer 2

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A regular black hole — that is, one with three times the Sun's mass — with have an event horizon radius of about 9 km. That means it has a huge density, about two quadrillion grams per cubic cm (2 x 101