NASA’s Mariner 9 became the first spacecraft to orbit another planet when it entered Mars’ orbit.
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Asaph Hall discovered Mars' second moon, called Phobos.
NASA launched the Mariner 4 space probe on a mission to Mars.
NASA launched its Mariner 7 space probe from Cape Canaveral atop an Atlas-Centaur rocket.
Viking I lands on Mars.
The famous Face on Mars photo is taken.
