A ‘ringing’ black hole matches scientists’ predictions
SMRTR summary
A black hole merger in January yielded the strongest gravitational wave signal ever recorded, 80 times above background noise. Two black holes, each about 30 solar masses, combined to form a larger one that vibrated like a bell. The waves matched predictions from Einstein's general relativity theory, with scientists detecting both the fundamental tone and first overtone. This confirmed Roy Kerr's 1963 mathematical model of spinning black holes and verified Stephen Hawking's area theorem on black hole surface expansion.
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