Only one spacecraft has ever visited Uranus or Neptune: Voyager 2, which flew past Uranus in 1986 and Neptune in 1989. Nearly four decades later, no mission has returned, leaving many of the biggest questions those flybys raised — about the planets’ interiors, strange magnetic fields, rings, and moons — still unresolved.
The strangest thing about Uranus and Neptune is not that they are distant. It is that, for all…
