1st
probe to reach Venus- Mariner 2, in 1962.1st
probe to reach Venus- Mariner 2, in 1962.
1st and
only probe mission to Mercury- triple fly-by accomplished by
Mariner 10 in 1974-75.
1st
probe mission to Jupiter- Pioneer 10, launched in 1972.
1st
probe to visit Saturn- Pioneer 11, in 1979.
1st
probe to reach Uranus- Voyager 2, 1986.
1st
probe to reach Neptune- Voyager 2, 1989.
1st
probe to a comet- International Sun-Earth Explorer intercepted
Comet Giacobini-Zinner, in 1983.
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