it was the one that visted mercury
Nobody has yet gone to the planet Mercury as yet, and I do not think that they will send anyone there. As it is hot.
Nobody has visited Saturn.
Not that anyone has heard of yet because Mercury is far to hot and has a short supply of oxygen for any life form to live on this planet.
No, nobody has yet. Although scientists at NASA are apparently finding evidence of water on this planet.
how mainy people visted costarica in 2012
As of 2021, only two spacecraft have visited Mercury: Mariner 10, which flew by three times in the 1970s, and MESSENGER (MErcury Surface, Space ENvironment, GEochemistry, and Ranging), which orbited the planet from 2011 to 2015. The European Space Agency's BepiColombo mission is currently en route to Mercury as well.
There have been no manned missions to Mercury.
It is not yet known.
Scientists do not yet know if Mercury has the element Mercury in it, they need further studies. AKA they have to get more "inside" of Mercury.
No spacecraft has visited Uranus yet. The only spacecraft to have flown by Uranus is Voyager 2, which passed by the planet in 1986. There are no current plans for a dedicated mission to Uranus.
we don't yet know