This is a neutron star. If a star goes supernova it might create this or a black hole. See, those rays are radiation waves. A noutron star spins so fast that it destroys anything that comes in contact with it. it weighs as much as every car in the united states put together!
After this comes a white dwarf. Or a dead neutronstar. It is rather harmless. It also weighs as much as every car in the United States put together.