NASA launched the Mars Science Laboratory probe, which carried the Curiosity Rover to Mars.
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NASA launched the Mars Observer, a space probe designed to study Mars' geology and climate.
America's robot spacecraft, the Viking I, successfully landed on Mars.
NASA launched the Mariner 4 space probe on a mission to Mars.
Earth-like calcium-rich deposits were found on Mars by NASA's Curiosity Rover.
NASA declared the conclusion of the Phoenix mission after contact was lost with the Phoenix lander.
