Yes.
No spacecraft has ever landed on Mercury. A couple have orbited around the planet.
Pioneer 11- arrived sept. 1979
The space probe "Voyager 2" flew past Neptune.
Since Earth's Moon was likely formed from a chance collision, the formation of moons may not have been a stable process in the inner solar system. Any moons that formed around Venus or Mercury could have been swept away by the stronger gravity of the Sun, as might smaller moons around Earth. If Mercury or Venus ever had satellites, they were lost long ago.
No. The furthest that any human has travelled in space so far has been to the moon.
No. The first artificial satellite launched was the Russian satellite, Sputnik 1.
No spacecraft has ever landed on Mercury. A couple have orbited around the planet.
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.
no. no humans have ever been to any of the other planets.
Pioneer 11- arrived sept. 1979
No one has actually ever stepped or been on mercury as no microbe would survive the long journey.
No. As far as we know, no man-made hardware has ever landed on Mercury.
no but has been photographed from distance/telescope in space
No. Humans have only been on Earth and the Moon.