01
A neutron star is the compact remnant produced when a massive stellar core collapses to densities comparable to atomic nuclei.
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02
During core collapse, electrons combine with protons and produce neutrons and neutrinos.
supported03
Pulsar timing measures neutron-star masses with great precision, X-ray observations constrain radii, gravitational waves from neutron-star mergers probe tidal deformability, and observed masses above two solar masses rule out many overly soft equations of state.