Scientists using NASA’s Kepler telescope have found the first Earth-size planet orbiting its star at just the right distance for water to exist on its surface. The finding, reported in this week’s ...

A team of astronomers that includes Penn State scientists has discovered the first Earth-size planet orbiting a star in the habitable zone A team of astronomers that includes Penn State scientists has ...

Sifting through observations from more than 100,000 distant stars, astronomers say they have discovered the first definitive Earth-sized planet that orbits in a habitable zone where water could exist ...

Kepler 186f is the most Earth-like exoplanet we've ever discovered, but it's so far away that details will remain scarce for a long time. By Francie Diep Published Apr 17, 2014 10:02 PM EDT Get the ...

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Kepler-186f is the first planet ever discovered that is both about the same size as the Earth, and orbits in the "habitable zone" around its star. This is the distance from a star at which a planet ...