Question: What is a neutron star?

Laurence Datrier answered on 11 Jun 2019: last edited 11 Jun 2019 3:14 pm

A neutron star is a very dense star made of particles called neutrons. They’re what’s left behind after a massive star goes supernova. They’re so dense that even though their diameter is only the size of a medium-sized city, their mass is about the same as that of the Sun!