The rocky alien planet Kepler 186f is an Earth-size world that could have liquid water on its surface, and possibly even life. It orbits a star 490 light-years away. - Credit: Karl Tate, Infographics Artist
Scientists have discovered Kepler-186f, the first Earth-size alien planet in the habitable zone of its host star. The so-called 'Earth cousin' just might have liquid water and the right conditions to support life.