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 ...

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 ...

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 ...

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 ...

Astronomers have spotted the two smallest, most Earth-like planets to be discovered outside our solar system. They are orbiting a star called Kepler-20 almost 1,000 light years away in the ...

Astronomers have achieved a big milestone in the search for another Earth: the two smallest confirmed planets ever found orbiting another star... and they're both about the size of Earth! Artist's ...

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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, ...

Even if you’re a big fan of exoplanets — that is, worlds orbiting stars beyond the sun — the flurry of major discoveries over the past few months may have been hard to process. Astronomers have lately ...

The same team that recently discovered the possibly water-covered, life-supporting planet, Kepler 22b, two weeks ago announced the discovery of two more Earth-sized planets on Monday. Ars Technica's ...

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 ...