Neutron star

Neutron stars are born from a supernova. They are so heavy that a teaspoon of a neutron star would be heavier than Mount Everest! Neutron stars that spin rapidly are called pulsars. They emit beams of electromagnetic radiation that sweep across the sky like a lighthouse beam, making them appear to pulse. When two neutron stars collide, generate an explosion called a Kilonova. As a result of the Kilonova, a black hole can appears.