Actually they already have visited a planet like the moon!
No astronaut has visited Venus yet.
An astronaut never landed on the sun
An ancient astronaut is a theoretical extraterrestrial being who it is believed by some may have been associated with paleocontact - the idea that aliens visited the planet Earth in ancient times and influenced human culture, technology or religion.
The amount of planet matter equal to that of the astronaut would annihilate.
twice
Venus has not yet been visited. maybe in the short future this could happen, but i think its to hot for man anyways.
earth has never visited another planet
no
earth is the first planet humans have visited and the only one
voyager 2
Dennis Tito was the first astronaut to travel to the planet Venus.
Mars is the planet that is least unlikely to be visited by humans