Neutronium, hyper-dense atomic nuclear material stripped of all electrons.
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Yes, if the star is massive enough when the core collapses a supernova explosion happens.
Yes, both black holes and neutron stars are remnants of the death of massive stars. Neutron stars form when the core of a massive star collapses but does not produce a black hole. Black holes are formed when the core of a massive star collapses beyond the neutron star stage.
Supernova
Supernova
When a star's core collapses and a giant explosion occurs, it is called a supernova. This explosive event releases an immense amount of energy and can outshine entire galaxies for a brief period of time.