Researchers reveal how quasars—intense radiation from supermassive black holes—shut down star formation in the early universe.
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How quasars shut down star formation in the early universe

1 Billion Solar Masses times sun Black hole mass
Few Hundred Million Years years Time after Big Bang
Less Than 5% of current age Universe age at formation
300 Million Years After Big Bang black hole age
Less Than 5% Of Current Age universe age when quasars formed