WASHINGTON: An international team of astronomers said Wednesday they have found an ancient black hole so big that it challenges theories on how they form and grow in the early universe.
The mass of the black hole, which formed only 900 million years after the Big Bang, is 12 billion times that of the Sun, and a shining object called quasar, produced by the black hole as it actively accretes surrounding materials, is 420 trillion times more luminous than our Sun, they reported in the British journal Nature.
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