Mercury
Marnier 10 studied 2 planets, Venus and Mercury. It studied Venus on it's way to Mercury. Marnier 10 managed 3 fly-bys on Mercury before running out of maneuvering gas.
Saturn
Mariner 8
Ranger 4 was the first American probe to strike the moon's surface.
Mercury was studied by the Mariner 10 Probe and has a crater pitted surface.
Mercury
mercury
Mercury
Mercury
Mariner 10
Marnier 10 studied 2 planets, Venus and Mercury. It studied Venus on it's way to Mercury. Marnier 10 managed 3 fly-bys on Mercury before running out of maneuvering gas.
Mercury
Mariner 2
The mariner spacecraft explored Mercury, Mars, and Venus. The first successful space probe and first spacecraft visit to a planet was Mariner 2.
The Mariner 9.
Saturn