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Neutron stars are the remains of massive stars, consisting mainly of a neutron core, covered with a relatively thin (about 1 km) crust of matter in the form of heavy atomic nuclei and electrons.
The nuclei of stars that died during the supernova explosion were compressed under the influence of gravity. So formed superdense neutron stars. Astronomers have established that the mass of neutron stars can be comparable to the mass of the Sun, while their radius does not exceed 10-20 kilometers.

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