For the first time,astronomers have observed a cosmic event using both gravitational waves and optical light, a major step forward in the original era of gravitational wave astronomy. Signals from the Laser Interferometer Gravitational Wave Observatory (LIGO) in the United States and the Advanced Virgo Interferometer in Italy pinpointed the location of two merging neutron stars in a galaxy 130 million light-years absent. Astronomers then used some 70 ground- and space-based telescopes across all seven continents to study the collision in X-ray, or ultraviolet,optical, infrared, and radio waves.
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