Voyager 1
Mariner 2 in 1962. The planet was Venus.
The first of two spacecraft to visit the planet was Mariner 10, which has mapped about 45% of the planet's surface from 1974 to 1975. The second is the MESSENGER spacecraft from NASA, which mapped another 30% during his trip to Mercury January 14, 2008. MESSENGER is now in orbit around Mercury to complete the mapping.
Mars Global Surveyor
Yes Mariner 2 flew past Venus. It was the first space probe to achieve this.
The New Horizons space probe was the first spacecraft to explore Pluto. The mission to the minor planet happened in 2015.
The First spacecraft was the MESSENGER. The First spacecraft was the MESSENGER.
The mariner spacecraft explored Mercury, Mars, and Venus. The first successful space probe and first spacecraft visit to a planet was Mariner 2.
venus was the first planet visited by the American spacecraft
Mariner 2 in 1962. The planet was Venus.
The mariner spacecraft first landed on Mars 1971 I think.
Mars, the planet, was first travelled to in 1965 by Mariner 4 (a spacecraft) by the country USA from NASA.
It's the closet and rather similar to the earth.
Venera 7 on Venus in 1970.
mariner 4
Every planet except Pluto has been explored by spacecraft.
Mariner 9
Venus was "hit" by the soviet Venera 3 in 1966.