A Neutron Star is the collapsed core of a massive star, formed
after the star goes supernova. The name derives from the fact
that neutron stars are so compact (one with the mass of the
Sun will only be about as big as a city), that the electrons
and protons of the atomic nuclei are jammed together into
neutrons. A pulsar is a rapidly rotating neutron star that
emits beams of radiation along a misaligned magnetic axis.
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for more information about pulsars.