Astronomers can't see the black hole, of course. But they can calculate its size by studying the bright light of its accompanying quasar. A quasar is the collection of light given off as superheated gas is squeezed as it is pulled into the black hole.
The light from the quasar that scientists have observed is 12.8 billion years old, roughly 875 million years after the universe was formed. There are roughly 40 other quasars formed during the billion years after the Big Bang. Compared to its peers, though, the newly discovered quasar (J0100+2802) i...
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