Pioneer 11 visited Saturn in 1979, Voyager 1 in 1980, and Voyager 2 in 1981. These missions were fly-by missions, but Cassini-Huygens arrived in 2004 and is still operating from orbit around Saturn.
All of the eight planets have been visited or orbited by space probes.
The Cassini spacecraft is the only spacecraft to have visited Saturn. It orbited the planet from 2004 to 2017, providing valuable data and images of Saturn and its moons.
April 2008 At present the only planet in our solar system that has not been visited (either by an orbiting spacecraft or flyby spacecraft) has been the recently planet downgraded body of Pluto. There is a mission currently in motion to visit this distant outpost.
No space missions have landed on Neptune or flown by it. The only spacecraft that has visited Neptune is Voyager 2, which conducted a flyby of the planet in 1989. There are no current plans for future missions to Neptune.
None. Humans have only landed on our moon.
All of the eight planets have been visited or orbited by space probes.
The Cassini spacecraft is the only spacecraft to have visited Saturn. It orbited the planet from 2004 to 2017, providing valuable data and images of Saturn and its moons.
April 2008 At present the only planet in our solar system that has not been visited (either by an orbiting spacecraft or flyby spacecraft) has been the recently planet downgraded body of Pluto. There is a mission currently in motion to visit this distant outpost.
voyager 2 is the only spacecraft that visited Uranus by a third grader
The US space program, including NASA, has successfully visited several planets in our solar system. These include Venus, Mars, Jupiter, Saturn, and Pluto (visited by the New Horizons spacecraft). Additionally, various probes have been sent to study other celestial bodies like comets, asteroids, and moons.
No manned missions have gone farther away than the moon. If you mean space probes or satellites, I think three
space probes
A space probe is an unmanned spacecraft sent into space.
No space missions have landed on Neptune or flown by it. The only spacecraft that has visited Neptune is Voyager 2, which conducted a flyby of the planet in 1989. There are no current plans for future missions to Neptune.
None. Humans have only landed on our moon.
The term "space probe" is normally limited to unmanned (robotic) spacecraft. So, no, space probes do not have people aboard them.
Donkies