NASA celebrated April Fool’s Day by telling the world that they found water on Mars.
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The Mars Polar Lander was launched.
Mariner IX took two photos of Mars' north pole.
Mars had a 'close encounter' with Earth at 34.8 million miles apart.
NASA's Mars Odyssey completed its 60,000th orbit around Mars.
Saturn, Jupiter, and Mars came into alignment. Medieval scholars believed this phenomenon brought forth the Black Death.
