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Not many. Gas giants can form on their own, they have composition similar to interstellar material (mostly hydrogen and helium).

Rocky planets can only form in proto disks around newly forming stars. Heavier materials (carbon and up) are concentrated this way.

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Well, that entirely depends on if the theory and models being used are correct. This article seems to indicate that many of those beliefs did not match reality. I think we should keep looking rather than discount out of hand. There are more things in heaven and earth, after all.

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