Johannes Kepler Johannes Kepler
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Johannes Kepler

After nine years in deep space collecting data that indicates our sky is filled with billions of hidden planets, NASA's Kepler Space Telescope has run out of fuel. On Oct. 30, 2018, NASA announced the retirement of the spacecraft. NASA/JPL-CALTECH/T. Pyle/Getty Images hide caption

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NASA/JPL-CALTECH/T. Pyle/Getty Images

After 9 Years In Orbit, Kepler Telescope Leaves A Legacy Of Discovery

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Circa 1612, German astronomer Johannes Kepler (1571 - 1630) Hulton Archive/Getty Images hide caption

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Hulton Archive/Getty Images