A neutron star is only around the size of a city, but one cubic centimeter contains the mass of the entire Earth

Neutrons stars are extreme objects that measure between 10 and 20 km across. They have densities of 1017 kg/m3(the Earth has a density of around 5×103 kg/m3 and even white dwarfs have densities over a million times less) meaning that a teaspoon of neutron star material would weigh around a billion tonnes. The easiest way to picture this is to imagine squeezing twice the mass of the Sun into an object about the size of a small city! The result is that gravity at the surface of the neutron star is around 1011 stronger than what we experience here on Earth, and an object would have to travel at about half the speed of light to escape from the star.

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