Quote:
Originally Posted by SolemnGolem
If the heat has radiated away, then presumably it would be cooler than plasma, though I'm not sure about the effect of gravitational density. Perhaps it's a metallic soup?
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Yes. All the way cold, in fact, as close to 0K as makes no difference. The iron star is one of those heat death of the universe, entropy has maximized, there is no more useful energy so nothing can happen kind of ideas. If protons could decay, they would have, so there wouldn't be any iron stars; but if not, that's all that's left.
(Perhaps that's why this iron is so dead to magic. Mana in that absurdly old universe succumbs, just like everything else. So not only does this iron not have any - zero Kelvin, zero Thaums -- it'll soak up ambient mana just as it'd soak up ambient heat until the iron gets back to being normal iron.)