https://en.wikipedia.org/wiki/Neutron_star
中子星（neutron star）是除黑洞外密度最大的星体，恒星演化到末期，经由重力崩溃发生超新星爆炸之后，可能成为的少数终点之一，质量没有达到可以形成黑洞的恒星在寿命终结时塌缩形成的一种介于白矮星和黑洞之间的星体，其密度比地球上任何物质密度大相当多倍。
A neutron star is a collapsed core of a massive supergiant star. The stars that later collapse into neutron stars have a total mass of between 10 and 25 solar masses (M☉), possibly more if the star was especially rich in elements heavier than hydrogen and helium.[1] Except for black holes, neutron stars are the smallest and densest known class of stellar objects.[2] Neutron stars have a radius on the order of 10 kilometers (6 mi) and a mass of about 1.4 M☉.[3]They result from the supernova explosion of a massive star, combined with gravitational collapse, that compresses the core past white dwarf star density to that of atomic nuclei.
