Although Uranus and Neptune are superficially twin planets, they are different enough to remind us -- as do Venus and Earth -- that we still have a lot to learn about the mix of natural laws and historical accidents that formed the planets and fashioned their destinies.

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Quote text and notes from Wikiquote: Timothy Ferris (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.