11/02/2016 6:00 pm
A pair of coalescing black holes, massive and dense monsters spiralling around each other. Just before merging into a single, even more gigantic black hole, they release a huge amount of energy in the form of gravitational waves - fluctuations in the fabric of space time.
This image shows a computer simulation of the gravitational waves that would ripple away from the black hole collision.
Gravitational waves were directly detected for the first time by the advanced Laser Interferometer Gravitational-Wave Observatory in 2015, and the discovery was announced on 11 February 2016.
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