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
Johannes Kepler Johannes Kepler
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Johannes Kepler
An illustration imagines what Kepler-186f may look like. T. Pyle/NASA Ames/SETI Institute/JPL-Caltech hide caption
Circa 1612, German astronomer Johannes Kepler (1571 - 1630) Hulton Archive/Getty Images hide caption