Mariner IX took two photos of Mars’ north pole.
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Viking I lands on Mars.
NASA's Mariner 9 became the first spacecraft to orbit another planet when it entered Mars' orbit.
Saturn, Jupiter, and Mars came into alignment. Medieval scholars believed this phenomenon brought forth the Black Death.
NASA's Opportunity Mars rover launched from the Florida Cape Canaveral Space Force Station.
The USSR launched the Mars 7 spacecraft from the Baikonur Cosmodrome in modern-day Kazakhstan.
