How does a neutron star form?
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Neutron stars form when a massive star collapses at the end of its life:
Star becomes massive: A star that’s four to eight times the size of our sun grows to an enormous size.
Star runs out of fuel: When the star runs out of fuel, its core collapses.
Supernova explosion: The star’s outer layers are blown off in a supernova explosion.
Core collapses: The star’s core collapses, crushing together protons and electrons into neutrons.
Neutron star forms: The core collapses past the density of a white dwarf star and becomes a neutron star.
Neutron stars are the smallest and densest known class of stellar objects, aside from black holes. They are made up almost entirely of neutrons, and are supported against further collapse by neutron degeneracy pressure.
A neutron star forms from the remnants of a supernova explosion of a massive star. When the core collapses, protons and electrons combine to form neutrons, resulting in an extremely dense object composed mostly of neutrons