If two neutrons stars that are orbiting were to collide, how big would the supernova explosion be?
Would a new black hole or a new supernova remnant be formed?
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When two neutron stars collide, the resulting supernova is called a "kilonova," producing much more energy than a regular supernova. Additionally, heavier elements are formed, such as gold, platinum, etc. Other effects of this collision include a gamma-ray burst and/or gravitational waves. The object formed after the event can either be a heavier neutron star, or a black hole (if the mass of the merger exceeds the maximum mass of a neutron star, about 3 solar masses).
As of right now, we have not detected a neutron star merger that is visible to the naked eye; almost all of them occurred in different galaxies, billions of light-years away. I hope this helps.