Yes. The space probe New Horizons flew by Pluto in 2015.
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.
have any robots or satellites ever landed on pluto
People say that in January 2006 New Horizons spacecraft was launched . but in 2015 it should make it to Pluto as long as nothing goes wrong.
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.
Not yet.
Currently no clear pictures if any dwarf planet exist, as none have been visited by a spacecraft. In 2015, however, the New Horizons spacecraft will fly by Pluto, and the Dawn spacecraft will enter orbit around Ceres.
Spacecrafts have never visited Pluto, but the New Horizons mission is on its way there.
Humans, no. Unmanned spacecraft, yes.
yes
Mercury does not have any natural satellites. However, it has been visited by two space probes: Mariner 10 in 1974-75 and Messenger in 2011. These are the two spacecraft that have provided most of the information we have about Mercury.
yes
Not yet, but one is on its way.