2014年4月18日 Science % ~" U/ d" Z- ]' y C1 V, f7 C1 G! N) `, \& I' P : Y/ g0 l6 a0 A6 |" {0 [
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COVER Artist's concept of Kepler-186f, a planet located ~500 light-years from Earth in the constellation Cygnus. The discovery of Kepler-186f confirms that Earth-sized planets exist in the habitable zone of other stars (that is, the range of distances from a star wherein liquid water might pool on the surface of an orbiting planet) and signals a major step closer to finding a world similar to Earth. See pages 249 and 277.- f; p! x- o/ W% o
Image: NASA Ames Research Center/SETI Institute/Jet Propulsion Laboratory–California Institute of Technology 0 ?/ p8 F& E+ @8 B; v