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These black holes are a type known as quasars: extremely massive objects that emit more light than the rest of the galaxy.
From The Daily Beast
The astronomers found that of the 93 quasars in the sample, 19 exhibited a measurable amount of polarization.
From The Daily Beast
And that helps BOSS: quasars are bright enough to be seen and mapped from 11 billion light-years away.
From The Daily Beast
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