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Neutron star 1

 A neutron star  is a type of compact star . Neutron stars are the smallest and densest stars known to exist in the Universe.[1] With a radius of only about 11 –11.5 km

(7 miles), they can, however, have a mass of about twice that of the Sun. They can result from thegravitational collapse of a massive star  that produces

a supernova. Neutron stars are composed almost entirely of  neutrons, which are subatomic particles with no net electrical charge and with slightly larger mass

than protons. They are supported against further collapse by the repulsive strong nuclear force as well as quantum degeneracy pressure due to the phenomenon

described by thePauli exclusion principle. Neutron stars are very hot and typically have a surface temperature around 6×105 K.[2][3][4][5][a] They are so dense that a

normal-sized matchbox containing neutron-star material would have a mass of approximately 13 million tonnes, or a 2500 m3 chunk of the Earth[6][7] The density of

the star is comparable to that of the nucleus of an atom, both residing in the same degree of magnitude. They have strong  magnetic fields, between 108 and

1015 times as strong as that of Earth. The gravitational field at the neutron star's surface is about 2×10 11 times stronger than on Earth. 

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