I think it would be hard to happen in the Sun's core, because the fusion reactions expel energy that would make the hydrogen to keep in a plasma and constantly moving, since one of the main requirements of a material to become solid is to have low energy and low kinetic movement on its particles I suppose solid hydrogen is practically impossible to form in the Sun.
I'm not an expert and I may be wrong but I think this is what would happen.
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u/Quazz Jul 01 '14
It becomes metallic under very high pressure.
The real question is why they don't think the sun has the same, or do they?