Just one, which was Voyager 2. It flew by Uranus in 1986.
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.
The exact number is zero.
There are many planets in our solar system that have not been visited by a spacecraft. As of now, the planet Uranus has not been visited by any spacecraft.
none
No manned missions have gone farther away than the moon. If you mean space probes or satellites, I think three
there a one on Pluto in the yr 2015
jupiter, uranus, neptune and pluto. also many other galaxies and solar systems.
jupiter, uranus, neptune and pluto. also many other galaxies and solar systems.
12
more than 10000 miles?
there are many probes in space. There is the Hubble space telescope, voyager voyager 2. Here are just some probes in space. there too much to name all of them.
Actually, there are very many space probes out there, like Cassini, Voyagers 1 and 2, Spirit and Opportunity, Galileo, the Viking Lander, and many more.