Technicians working inside the Astrotech Space Operations facility near NASA's Kennedy Space Center look over the Kepler spacecraft soon after it arrived in Florida in preparation for launch. [Read ...

Kepler-186f could be Earth-like in many ways—but its light isn’t. Here’s why plants there wouldn’t be green, and what that reveals about life on other worlds Trump’s big climate policy reversal is a ...

NASA’s Kepler Space Telescope confirmed more than 2,600 exoplanets, including several located in the so-called habitable zone, where liquid water could exist. Worlds like Kepler-186f, Kepler-452b, and ...

Kepler-186f is a rocky little world in the Goldilocks zone around its star. It's the fifth planet from its parent star, and yet it orbits at a distance comparable with Mercury's orbit around our sun.

The first Earth-size planet orbiting a star in the “habitable zone” — the range of distance from a star where liquid water might pool on the surface of an orbiting planet.