The Kepler-186 system is home to Kepler-186f, the first validated Earth-size planet orbiting a distant star in the habitable zone -- a range of distances from a star where liquid water might pool ...

Kepler 186f, named after NASA’s Kepler planet-finding mission, is 10 percent wider than Earth (8,700 miles versus 7,918 miles in diameter) and takes only 130 days to complete one full orbit around its ...