hi
Pluto has yet to be visited by a spacecraft because it is so far away.
Depends on whether you say Pluto is a planet or not. If you say it isn't, then there are no planets that haven't been visited by a spacecraft. If you say it is, then there is one that hasn't been visited yet, but one is on the way.
All 8 of the planets in our solar system have been visited by spacecraft, either fly-bys, or actual landings. The dwarf planet pluto has yet to be visited, but a space probe called New Horizons is on its way and should reach Pluto in 2015.
Aircraft travel through the air, not through space, so they can't go to Pluto. No spacecraft have been to Pluto yet, although one is on the way.
No one has visited Pluto yet.
no it has not yet
PLUTO
No robots have been to Pluto just yet. However, come July 2015, the spacecraft New Horizons will arrive to study Pluto and it's moons.
None have yet been to Pluto. The New Horizons spacecraft it currently heading towards it but will not get there until 2015.
Not yet, but the "New Horizons" space craft was launched in January 2006. It is expected to reach Pluto some time in 2015 if nothing goes wrong.
No humans have visited Mars yet. Only robotic spacecraft, like the Mars rovers, have been sent to explore the planet.
As Pluto is the last known planet, and is very , very far nobody has visited it as yet.