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The Question

(Submitted September 25, 2013)

In the time frame of 500 million to 750 million years after it all started, I mean the expansion, is there any evidence of what came first, black holes or galaxies?

The Answer

This is a question that is still unanswered. There is strong evidence that the central black holes influence galaxy evolution by pulling in gas and energizing the local environments, but it is not clear whether the black holes formed first from the primordial gas clouds, or whether they came only after the stars were formed. In any case, there is apparently the need for some sort of "seed" to start the formation of a galaxy, perhaps dark matter.

Cheers,

Hans Krimm
for Ask an Astrophysicist

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