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Merging black holes
Black holes merging. Computer artwork of two supermassive black holes about to merge. Jets of superheated gas are being emitted from their edges. Each black hole was once at the centre of its own galaxy. Black holes are formed when the core of a star collapses under its own weight, increasing its gravitational field to the point where nothing can escape, not even light. Black hole mergers are the most powerful events in the universe, releasing more energy than all of the stars in the universe combined.
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