Credit: ESAWhat Is a Neutron Star?Besides black holes, neutron stars are among the most baffling objects in the Universe.A neutron star is formed in the last minutes of the life of a really large star (with more than about 8 times the mass as our Sun), when the nuclear fuel in its core ultimately runs out. Its density is so high that a sugar cube-sized object of neutron star material would weigh as much as all the people on Earth.Due to severe pressure, the electrons and protons present in normal matter fuse together with the outcome that these exotic stars are composed nearly completely of neutrons. Because of this, the radio signal appears to be pulsating and these neutron stars are called pulsars.When a neutron star and a normal star are orbiting each other at a close distance, the neutron star can draw product away from its buddy.