Yes. A neutron star is a large star that has collapsed to the point that the subatomic particles in its atoms have all merged to become neutrons. Gravity is so strong that light cannot escape. The density of a neutron star is is difficult to imagine.
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Last edited at 8:05PM on 12/22/2012
A neutron star is a star whose mass is up to 3 solar masses or so, but whose diameter is only about 8-10 miles. It supports its own weight against collapse with its neutron degeneracy pressure, a quantum mechanical force coming about because of Pauli's exclusion principle. Many neutron stars have been found. The most famous one is the Crab pulsar (pulsars are a class of neutron stars). They are called neutron stars because most nucleons in their core are neutrons. Neutron stars evolve from regular (main sequence) stars more massive than the Sun.