That is because, despite having many times more mass than the sun, black holes are smaller than the sun with radii ranging from 6 miles to 190 miles (9 kilometers to 300 kilometers).
—
Robert Lea,
Space.com,
8 Oct. 2026
Some of the most cataclysmic events in the cosmos, such as mergers of supermassive black holes, should produce a very specific gravitational wave signature, according to general relativity.
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