New recipe found for making supermassive black hole

Take two primordial galaxies, slam them together to create ‘dark collapse’


ANCIENT HEAVYWEIGHT  A quasar like the one illustrated here is an ultrabright galaxy with a supermassive black hole at its center. Scientists want to know how black holes grew fast enough to fuel quasars found less than a billion years after the Big Bang.

M. Kornmesser/ESO

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