NASA’s Mariner 9 became the first spacecraft to orbit another planet when it entered Mars’ orbit.
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The famous Face on Mars photo is taken.
One of Mars' moons, 'Deimos,' was discovered by an American astronomer, Asaph Hall.
NASA's Mars Odyssey completed its 60,000th orbit around Mars.
A conjunction of Sun, Mercury, Venus, Mars, Jupiter, Saturn, and the Moon occurred.
Water-bearing minerals were discovered on Mars by NASA's Curiosity Rover.
