Nuk
I think there is no spacecraft on Mercury because it is to close to the sun, the spacecrafts would just melt.
No it can't because it is too small and to close to the sun.
No, Mercury is too close to the sun and pointing the HST in that direction could possibly damage the sensitive instruments on board.
The space probe Voyager 2 passed close to Neptune in 1989 for purposes of observation. It also passed by its moons Nereid and Triton.
The space above the mercury is airtight, there is no air above the mercury
None.
Mercury orbits very close to the Sun and looking near to the Sun could damage the telescope.
By the space race
The Mariner10 space probe and the Mercury Messenger space probe.
No space probe has ever landed on Mercury.
Project Mercury.