What physical process creates a neutron star from a massive star remnant?

Answer

Protons and electrons are crushed together.

Following a supernova, if the remaining core is sufficiently massive, it continues to collapse until the force becomes great enough to crush protons and electrons together. This forms neutrons, creating an incredibly dense object known as a neutron star. This material is so dense that a very small volume would weigh billions of tons.

What physical process creates a neutron star from a massive star remnant?

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