Contents

18 April 2014
Vol 344, Issue 6181

About The Cover

Cover image expansion

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.
Image: NASA Ames Research Center/SETI Institute/Jet Propulsion Laboratory–California Institute of Technology