Hundreds, and perhaps thousands, of different individual spacecraft have visited
Earth. As far as anybody knows, every one of them was built on earth and launched
from earth before it landed here. In fact, everyman-made space probe, regardless
of what or where it was ultimately designed to explore, has visited earth at one time
or another.
A spacecraft left earth in late 1957 and returned in early 1958. Other than human spacecraft, no alien space craft has ever left or come to visit our planet, that we know of. It is possible some alien space craft may have visited earth millions of years ago. It is highly unlikely any craft has done so within the past few centuries.
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.
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.
Pluto has yet to be visited by a spacecraft because it is so far away.
Astronauts have visited the Moon, which is not a planet but a natural satellite of Earth. Other than the Moon, astronauts have not visited any other planets in our solar system. Only unmanned spacecraft have been sent to explore other planets.
All of the eight planets have been visited or orbited by space probes.
The Mariner Ten and the Messenger
It's not clear what you mean by "visited", here. All man-made spacecraft ORIGINATED from Earth. Some of them later RETURNED to Earth as well, and quite a few of them were designed to STUDY Earth (for example, weather satellites).
No spacecraft has visited all the planets.
Nobody knows for sure. If they do know, they aren't telling.
It's the closet and rather similar to the earth.
Pluto will be visited by the spacecraft New Horizon in 2015
Every known spacecraft began on earth and went to other places. That's also true of every known drawing, component, fragment, subsystem, and model of spacecraft. Few of them ever returned to earth.
Yes. Every spacecraft ever made by humans originated on Earth and most never went farther than an orbit around Earth. Many have returned to the surface.
voyager 2
Voyager 2 is the only spacecraft to have currently visited both.
A spacecraft left earth in late 1957 and returned in early 1958. Other than human spacecraft, no alien space craft has ever left or come to visit our planet, that we know of. It is possible some alien space craft may have visited earth millions of years ago. It is highly unlikely any craft has done so within the past few centuries.