Question

what is neutron star​

Answer 1

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A neutron star is the collapsed core of a giant starwhich before collapse had a total mass of between 10 and 29 solar masses. They result from the supernova explosion of a massive star, combined with gravitational collapse, that compresses the core past white dwarf stardensity to that of atomic nuclei.

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Answer 2

a celestial object of very small radius (typically 30 km) and very high density, composed predominantly of closely packed neutrons. Neutron stars are thought to form by the gravitational collapse of the remnant of a massive star after a supernova explosion, provided that the star is insufficiently massive to produce a black hole.