 When two neutron stars orbit each other closely, they spiral inward as time passes due to gravitational radiation.When the two neutron stars meet, their merger leads to the formation of either a more massive neutron star, or a black hole (depending on whether the mass of the remnant exceeds the Tolman–Oppenheimer–Volkoff limit).The merger can also create a magnetic field that is trillions of times stronger than that of Earth in a matter of one or two milliseconds.