At just 0.010AU from Earth, 4179 Toutatis became the closest asteroid to Earth in the last century.
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Pale Blue Dot, an iconic photo of our Earth, was taken by Voyager 1 space probe.
NASA's Spitzer Space Telescope discovered a star with seven Earth-sized planets orbiting it.
Halley's Comet made its closest approach to Earth in recorded history.
NASA announced they had found 'Earth's bigger, older cousin.'
French mathematician Pierre Louis Maupertuis began his journey to Lapland to plot the shape of the Earth.
