mariner 10 in 1974 throw 1975
No one has every been to Mercury. The furthest man has been is to the Moon. Probes have been sent to Mercury
No human explorations has been nor can be on Mercury.
The US has never been to Mercury.
Mercury is a relatively rare element, it has not been found on Mercury the planet but theoretically it can be detected.
There have been no manned missions to Mercury.
there were about 7 missions to mercury
No natural satellites of Mercury have been discovered.
Yes, there have been probes sent to Mercury. Messenger and Mariner 10.
no one has ever been to mercury because there is not enough oxygen and it is too hot.
Mercury is about 4.6 billion years old.
No.
Mercury has no atmosphere to speak of, and therefore it has no weather.