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Neutron Stars

A neutron star is created when a star (which is at least 1.4 times the mass of the Sun) runs out of fuel and collapses under its own gravity. The compression is so strong that all of the protons and electrons are converted to neutrons and the size of the star is reduced to about a 10 mile diameter, perfectly round smooth ball. Some neutron stars rotate at over 1000 times a second.