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LiveScience
LiveScience
Elizabeth Howell

Physicists detect rare 'second-generation' black holes that prove Einstein right... again

Black Hole Albert Einstein Mergers
An illustration of two colliding black holes.

Scientists have found two pairs of merging black holes, and they think the larger one in each merger is a rare "second-generation" veteran of a previous collision.

The two larger black holes' unusual behavior, observed through ripples in space-time called gravitational waves, was described Oct. 28 in The Astrophysical Journal Letters.

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