A201: A neutron star is a very small, super-dense star which is composed mostly of tightly-packed neutrons. This hard-to-see body has a thin atmosphere of superhot hydrogen plasma and a crust. It has a diameter of about 5-10 miles (5-16 km) and a density of roughly 10 15 gm/cm3. Neutron stars are formed from supernova explosions.
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