Kepler-186f, the first Earth-size planet in the “habitable zone” of another star, has been discovered by NASA. Astronomers using the agency’s Kepler Space Telescope found Kepler-186f orbiting a star ...

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 ...

Just as real-estate prices in parts of North America have started to get expensive again, NASA says it has confirmed for the first time the existence of an Earth-like planet that may hold liquid water ...

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 ...

Astronomers have for the first time discovered a rocky, Earth-sized exoplanet that might hold liquid water—a necessary ingredient for life as we know it. The planet Kepler-186f is the fifth and ...

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

Kepler-186 and the Solar System: The diagram compares the planets of the inner solar system to Kepler-186, a five-planet system about 500 light-years from Earth in the constellation Cygnus. The five ...