This story was updated at 2:40 EST. Astronomers on Tuesday (Dec. 20) announced the discovery of the first two Earth-size alien planets — a historic find for sure, but the newfound worlds didn't ...

NASA’s Kepler mission has discovered the first Earth-size planets orbiting a sun-like star outside our solar system. The planets, called Kepler-20e and Kepler-20f, are too close to their star to be in ...

NEW YORK — Scientists have found two Earth-sized planets orbiting a star outside the solar system, an encouraging sign for prospects of finding life elsewhere. The discovery shows that such planets ...

WASHINGTON (Reuters) - NASA's Kepler mission has discovered the first Earth-size planets orbiting a sun-like star outside our solar system, a milestone in the search for planets like the earth, the ...

NASA's Kepler spacecraft is starting to put the pieces together in its search for virtual Earth twins in other planetary systems. Kepler, which launched in 2009, is on the lookout for planets that are ...

For life as we know it to arise on another planet, scientists think the alien world must have three key ingredients: organic molecules that can form complex structures, energy to jiggle those ...

MOFFET FIELD, California - NASA's Kepler mission has discovered the first Earth-sized planets orbiting a sun outside our Solar System. NASA says the planets - Kepler-20e and Kepler-20f - are too close ...

MOFFETT FIELD, California, January 27, 2012 (ENS) – The Kepler spacecraft has discovered 11 new planetary systems hosting 26 confirmed planets, the National Aeronautics and Space Administration, NASA, ...

Yahoo Racing is powered by Motorsport Network, providing expert reporting, analysis, and insider access across the world’s top racing series. Astronomers on Tuesday (Dec. 20) announced the discovery ...

Artist's rendering of the size of newly-discovered exoplanets Kepler-20e and Kepler-20f in comparison to Earth and Venus. Scientists using NASA’s Kepler spacecraft are getting tantalizingly close to ...