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One idea from the morning talks on supermassive black holes in galaxies in the early universe.

Do the black holes form from the direct collapse of massive gas clouds: "the heavy seed model", or from massive stars: "the light seed model"? The evidence now favors heavy seeds. But, it could be both, and they might look different.

I'm reminded of the debate about what makes white dwarf supernovas. Both of the two competing scenarios may happen, and one may make unusual supernovas.
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