the moon is the closet anybody has been
no one has ever been to mercury because there is not enough oxygen and it is too hot.
No space probe has ever landed on Mercury.
No.
We do not know, since no man has ever been to Mercury.
Mercury is A planet that nobody has been on it is far to hot. Plus it can get up to over many degrees C or F and Mercury is a gas planet so even the stuff on Mercury has a hard time sheilding it's way from the sun.
Yes about 100 a year
No, the farthest that people have gone is to the moon.
no. no humans have ever been to any of the other planets.
MANY times.
There is no record of any such find.
Yes.