In 2015, the Laser Interferometer Gravitational-Wave Observatory (LIGO), made history when it made the first direct detection of gravitational waves--ripples in space and time--produced by a pair of colliding black holes.
In 2015, the Laser Interferometer Gravitational-Wave Observatory (LIGO), made history when it made the first direct detection of gravitational waves--ripples in space and time--produced by a pair of colliding black holes.
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