A supernova with a mass between about 1.5 and 3 times the mass of the collapses under until it consists almost entirely of . Nuclear forces prevent these squashing any closer. Neutron stars are only about 10 kilometers across and have a density of 1 hundred thousand billion (1014 ) times as dense as water.
Pulsars are rotating neutron stars. The rapid pulses of they emit are generated by their very strong , which are characteristic of all neutron stars.
Note that a star smaller than this will collapse into a , while a larger star will collapse into a .
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