Scientists in the United States say they have finally proved one of Einstein's theories and found direct evidence that when two black holes collide they create gravitational waves that bend the flow of time.
The discovery, revealed in Washington on Thursday, is being hailed as a huge scientific achievement.
Our US Correspondent Simon Marks reports,
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Scientists have spent decades trying to prove that Einstein was right.
Now they say they’ve recorded the sound of two black holes colliding.
Gabriela Gonzales is with Louisiana State University and played the sound publicly for the first time at a press conference in Washington.
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