Neutron star merger
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A neutron star merger is the stellar collision of neutron stars. When two neutron stars fall into mutual orbit, they gradually spiral inward due to the loss of energy emitted as gravitational radiatio
Artist's impression of neutron stars merging, producing gravitational waves and resulting in a kilonova
NGC 4993
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NGC 4993 is a lenticular galaxy located about 140 million light-years away in the constellation Hydra. It was discovered on 26 March 1789 by William Herschel and is a member of the NGC 4993 Group.
2MASS image of NGC 4993