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.
There has been no landings or humans to the planet Mercury.
Yes, but they have not landed.
No. Humans have only been on Earth and the Moon.
No human has ever visited Mars. None have ever been further than Earth's moon.
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.
No space probe has ever landed on Mercury.
No person has ever visited Mars yet.
No.
yes
The space shuttle is an Earth orbit vehicle. No humans have ever travelled to any body other than the Moon (from 1969 to 1972). All other space exploration has been by unmanned probes.