NASA launched the Viking 1 planetary probe toward Mars.
The Viking 1 was the first successful Mars lander in history.
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NASA launched the Mars Observer, a space probe designed to study Mars' geology and climate.
NASA's Ingenuity helicopter took off for its 72nd and final flight on Mars.
Viking I lands on Mars.
After seven months of travel, the Mars Reconnaissance Orbiter arrived safely to Mars.
Water-bearing minerals were discovered on Mars by NASA's Curiosity Rover.
