Neutron star

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A neutron star is a very small, super-dense star which is composed mostly of tightly-packed neutrons, supported by the exclusion principle repulsion. This remnant of a star after it has exploded as a supernova has a thin atmosphere of superhot hydrogen plasma and a diameter of about 5 - 16 kilometers, with a density of roughly 1015 gm/cm3.

Beneath the atmospheric layer is a crust of mainly iron and other heavy nuclei. Under this layer lies a mantle of superfluid neutronium, which at the core can become mixed with quark matter. Most neutron stars rotate fast, with periods ranging from a few seconds down to milliseconds.


Neutron stars are one source of neutronium fuel.

See also