Space

NASA’s Kepler Telescope Discovers First Earth-Size Planet in ‘Habitable Zone’

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Kepler-186f
Kepler-186f resides in the Kepler-186 system about 500 light-years from Earth in the constellation Cygnus. The system is also home to four inner planets, seen lined up in orbit around a host star that is half the size and mass of the sun. Image Credit: NASA Ames/SETI Institute/JPL-Caltech

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