eli5 are neutron stars composed of neutrons, or is it quark-gluon plasma?
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Neutron stars are composed primarily of neutrons, which are subatomic particles that are found in the nucleus of an atom. These neutrons are held together by the strong force, which is one of the four fundamental forces of nature.
At the extremely high densities found in the interior of a neutron star, it is possible that the neutrons themselves may break down into their constituent quarks, forming a state of matter known as quark-gluon plasma. However, this is still an active area of research and it is not yet clear exactly how matter behaves at these extremely high densities.
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