The artist's concept depicts Kepler-186f , the first validated Earth-size planet to orbit a distant star in the habitable zone—a range of distance from a star where liquid water might pool on the ...

It's hard to remember now, but there was a long period of time in which scientists weren't sure how many planets might actually exist throughout the galaxy, much less how likely it might be to find a ...

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.

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 ...

Welcome to Kepler-186 f. A distant alien world, bathed in the dim glow of its small star. Today, we're sending Chase on a mission to settle here. Yeah, this won't be easy.

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 administration proposes Colorado ...