no but has been photographed from distance/telescope in space
Pluto
Pluto has yet to be visited by a spacecraft because it is so far away.
yes, spacecraft have visited Mars, but the results haven't always been positive. More than half of the attempts to send a spacecraft to the planet have failed.
Someone has landed on mercury but died almost instantly
I'm working on this class project about any probes that has visited Mercury and I need to know how long this probe has been in space so please answer this is due tomorrow!
no one has ever been to mercury because there is not enough oxygen and it is too hot.
In a space shuttle usually but now that has been decommisioned the only way to get into space is to build your own (safe) space craft or go to Russia where you can get into space using their space craft.
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.
The space shuttle is an Earth orbit vehicle. No humans have ever travelled to any body other than the Moon (from 1969 to 1972). All other space exploration has been by unmanned probes.
No one has actually ever stepped or been on mercury as no microbe would survive the long journey.
No space probe has ever landed on Mercury.
The space probe Mariner 10 has been sent to Mercury. Currently the unmanned space probe MESSANGER is photographing and studying Mercury.