A 1971 prediction by Stephen Hawking just came true with a cosmic collision 1.3 billion light-years away: Now scientists are trying to understand how

A prediction made by Stephen Hawking some 50 years ago has just come true and now, scientists are trying to understand how it reinforces fundamental principles of modern physics. A collision between two black holes about 1.3 billion light-years from Earth has provided the most precise observational evidence ever obtained for a prediction presented by the late physicist and cosmologist.

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