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Astronomers have found the fastest rotating black hole to date​​



In the sixth decade after its discovery, the first black hole discovered in history still caused astronomers to scratch their heads. It turns out that the cosmic behemoth at the core of the Cygnus X-1 system is 50% larger than previously thought, making it the heaviest stellar-mass black hole ever directly observed.

Based on new observations, an international research team estimates that black holes are 21 times the mass of our sun and spin faster than any other known black hole. The recalculated weight has caused scientists to reconsider how bright stars that become black holes evolve and how quickly they peel off before death.


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