Nobody has visited mercury.
no one has ever been to mercury because there is not enough oxygen and it is too hot.
no but has been photographed from distance/telescope in space
No one has actually ever stepped or been on mercury as no microbe would survive the long journey.
All spacecraft (from Earth) that have visited Mercury have been robotic. There were no human passengers. The chances are near zero that a stowaway microbe would have survived the long journey.
it was the one that visted mercury
Nobody has ever visited Mercury due to its highly inhospitable surface conditions. Temperatures can vary by as much as 600 degrees Kelvin. Surface conditions have been observed for many centuries using telescopes, both on Earth and from space. The surface is hard, rocky, and cratered in a way similar to the moon.
Planets that have been visited by spacecrafts include Mars, Venus, Mercury, Jupiter, Saturn, Uranus, and Neptune. Additionally, the spacecraft Voyager 2 has conducted flybys of both Uranus and Neptune.
No person went on Mercury or might not ever go on Mercury because of its average temperature of 700degres Fahrenheit or around 350degres Celsius.
Messenger
Yes, but they have not landed.
Juan Alejandro