Art of Space

The planet Kepler-186f, the first validated Earth-size planet to orbit a distant star in the habitable zone, which is a range of distance from a star where liquid water might pool on the planet's surface. The discovery is the closest scientists have come so far to finding a true Earth twin. The star, known as Kepler-186 and located about 500 light years away in the constellation Cygnus, is smaller and redder than the sun. (Photo by Reuters/NASA/JPL-Caltech)
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