LYNETTE COOK / SCIENCE PHOTO LIBRARY LYNETTE COOK / SCIENCE PHOTO LIBRARY
Colliding black holes. Illustration of the merger of two black holes, a phenomenon that creates gravitational waves (shown here as ripples) as predicted by Einstein's theory of general relativity. The effect is most pronounced where extremely massive objects (black holes or neutrons stars) are subject to extremely high acceleration. In February 2016, gravitational waves were detected for the first time, 100 years after Einstein's prediction. The waves emanated from the collision of two black holes around 1.3 billion light years away. The waves were detected by the LIGO detectors in the USA.
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