yes, there was a known satellite sent to uranus named Voyager 2 from USA. It encountered more information about Uranus.
As of 2011, the planet Uranus has 27 known moons. (list at the related question)
No. Earth is the only planet known to have life.
No space probes have visited Uranus to date. The only spacecraft that has conducted a close flyby of Uranus was NASA's Voyager 2 probe in 1986. There are proposed missions in development that aim to send probes to Uranus in the future.
I don't think any have, except for "Voyager 2" which flew past in 1986.
Uranus has 13 rings. Saturn also has 13 rings. So that means Uranus does not. (I think....)
No, it is not currently possible for a spacecraft to land on Uranus because of its lack of a solid surface. Uranus is a gas giant composed mostly of hydrogen and helium, with no firm ground to land on. Any probe sent to Uranus would have to study the planet from its atmosphere or orbit.
True. Uranus has 27 known moons, which is more than any other planet in our solar system.
I don't know of any planet with exactly 21 known moons. The best answer is probably "Uranus" with 27 moons (natural satellites).
no there are not any storms on uranus
No. Miranda is itself a moon of Uranus. No known moon has a moon of its own.
No, Uranus does not orbit around any plants. Uranus doesorbit around the sun.
Uranus doesn't have any active plate tectonics. Uranus is made out of gas and does not contain any solid surfaces.