what is the difference between black holes and neutron stars?

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Both Black holes and neutron stars are product of a dying star. When a star dies, it spent all of its energy and then collapses. Their difference lies on their parent star. For the purpose of this discussion, we compare them with the mass of the sun. If a star...

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Black Hole: An object with a gravitational field so strong, not even light can escape. Has a mass ranging anywhere from 1.5 solar masses (stellar-mass) to billions of solar masses (supermassive black holes). Now, the density varies just as much. An earth sized black hole would have a density around 2 x 10^30 kg/m^3, while a supermassive black hole (believed to be at the center of most galaxies) would have a density similar to that of water.

Neutron Star: Collapsed remnant of a supernova. Has a mass ranging from about 1.35 solar masses to 2.1 solar masses. They typically have densities varying from 8 x 10^13 g/cm^3 - 2 x 10^15 g/cm^3, or about the density of an atomic nucleus.