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Published April 17, 2014, 12:00 AM

Kepler-186f


The artist's concept depicts Kepler-186f , the first validated Earth-size planet to orbit a distant star in the habitable zone, a range of distance from a star where liquid water might pool on the planet's surface. The discovery of Kepler-186f confirms that Earth-size planets exist in the habitable zones of other stars and signals a significant step closer to finding a world similar to Earth. (NASA)
Read the article: NASA discovers Earth-sized planet that may sustain life