voyager 2 is the only spacecraft that visited Uranus
by a third grader
Uranium
no
Just one, which was Voyager 2. It flew by Uranus in 1986.
No sadly not. It is the only planet not (when this answer was written) planed to be studied by spacecraft. Poor Uranus.
The exact number is zero.
Voyager 1 and Voyager 2.
There hasn't but in the future maybe.
No probes or vehicles have ever landed on Mercury.
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They didn't. The farthest humans have been from Earth is the moon. Uranus is many times farther away. Uranus has been visited by unmanned space probes.
Uranus is the blandest-appearing planet as revealed visually by space probes.
mercury venus mars Jupiter Saturn uranus and neptune