"Uranus is a fascinating planet that has been lamentably underrated as a target
for exploration, partly because its name is the butt of many jokes. Neptune may
have lucked out in the name game, but its enormous distance from Earth also makes
it an inconvenient destination for space probes.

As a result, Uranus and Neptune are the least explored planets in the solar
system, having only ever been visited briefly by NASA’s Voyager 2 flyby in the
1980s. But that may change due to the approach of a rare cosmic alignment that is
encouraging scientists to send probes back to these lonely gas giants in the outer
solar system."

See:

https://www.vice.com/en_us/article/z...o-visit-uranus