I know that in reality, you could never visit these planets because they are not solid, but if the Traveler somehow turned the Gas Giants into solids, which one would you travel too. And please, be mature when voting, don't just vote for Uranus just because it's called Uranus.
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When I was younger it blew my mind that a planet could not have a rocky surface... That and planets like Saturn and Jupiter are the size of many Earths. I'd assume there'll be floating outposts or just moon outposts for those planets.