Mars had a “close encounter” with Earth at 34.8 million miles apart.
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NASA celebrated April Fool's Day by telling the world that they found water on Mars.
The first-ever photograph was taken of the Earth from the surface of the Moon.
French mathematician Pierre Louis Maupertuis began his journey to Lapland to plot the shape of the Earth.
NASA launched the Mars Observer, a space probe designed to study Mars' geology and climate.
NASA launched the Phoenix spaceship from the Cape Canaveral Air Force Station, Florida, US.
