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.

Voyager 2 remains the only spacecraft to have visited Uranus and Neptune, leaving many ice-giant questions to be answered by a future orbiter or probe. The post 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. appeared first o