Which came first, black holes or galaxies? - Technology & science - Space - Space.com | NBC News: Astronomers may have solved a cosmic chicken-and-the-egg problem: Which came first — galaxies or the supermassive black holes in their cores?
For several years now, researchers have known that galaxies and black holes must have co-evolved, with budding galaxies feeding material to a growing black hole while the immense gravity of the black hole generated in its vicinity tremendous radiation that in turn powered star formation. But the scientists hadn't pegged the starting point.
"It looks like black holes came first. The evidence is piling up," said Chris Carilli of the National Radio Astronomy Observatory in New Mexico.
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