Neutron stars are comprised mostly of neutrons, being produced ounce a supernova explodes, forcing protons and electrons to combine and produce neutrons. A neutron star has the mass three times grater than the sun and I diameter of only 20 km. The power from the supernova that birthed a Neutron star gives it an extremely quick rotation, causing it to spin several times in a second, rotating around 43,000 times per minute, gradually slowing over time. If the stars mass was to be any greater it would collapse on its self causing a black hole.
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