You can call terraforming on those....but you're right, it's fiction. It would still annoy me, though, since it makes even less sense then the other two.
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Well there is ice on Uranus. Read the first paragraph. http://en.m.wikipedia.org/wiki/Uranus
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True, but how would they see through those clouds? Mercury would be a better option for new planets.
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It wouldn't be bad. Any addition would be welcome honestly. But since you don't like my anus... Uranus, then you'll have to vote for another option.