How dense are neutron stars?

Despite their small diameters—about 12.5 miles (20 kilometers)—neutron stars boast nearly 1.5 times the mass of our sun, and are thus incredibly dense. Just a sugar cube of neutron star matter would weigh about one hundred million tons on Earth. read more

A neutron star is so dense that one teaspoon (5 milliliters) of its material would have a mass over 5.5 × 10 12 kg, about 900 times the mass of the Great Pyramid of Giza. In the enormous gravitational field of a neutron star, its weight would be 1.1 × 10 25 N, which is about 15 times the weight of the Moon. read more

The density of neutron stars is, again, almost beyond comprehension. The density of a neutron star has a range of 8 x 10^13 g to 2 x 10^15 g per cubic centimeter. Although hard to believe, the density of a neutron star is about equal to the density of the nucleus of an atom. read more

The densest material found on earth is the metal osmium, but its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. A neutron star is the collapsed core of a large star (usually of a red giant). read more

The degeneracy pressure is so rigid that if you have a supergiant star with a neutron star core, and the material from the envelope starts to collapse, the ricochet of material off the neutron star will ultimately produce an explosion that can outshine an entire galaxy. read more