Though neutron stars typically have a radius on the order of 10 kilometres (6.2 miles), they can have masses of about twice that of the Sun.
They result from the supernova explosion of a massive star, combined with gravitational collapse, that compresses the core past the white dwarf star density to that of atomic nuclei.
Once formed, they no longer actively generate heat, and cool over time; however, they may still evolve further through collision or accretion. ...”
“A neutron star is so dense that one teaspoon of its material would have a mass ... about 900 times [that of] the Great Pyramid of Giza.”
https://en.wikipedia.org/wiki/Neutron_star
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