In this space wallpaper, 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 ...

Although Kepler 22-b, discovered earlier this year by NASA’s planet-hunting telescope, is like a temperature twin to Earth, a new announcement today reveals two exoplanets that are Earth-like in size.

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 ...

The first two Earth-like worlds orbiting another star have been detected, although neither are believed to be suitable for life. But if the planets had water in the past, there's a good chance they ...

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 ...

NASA’s star-gazing telescope Kepler has added to its amazing discoveries list by spying the first Earth-size planets orbiting a Sun-like star outside our solar system. NASA says while the planets are ...

CAMBRIDGE, Mass., Dec. 20 (UPI) -- NASA says its Kepler space telescope has discovered the first Earth-size planets orbiting a sun-like star outside our solar system. While the planets, called ...

This story was updated at 1:54 p.m. ET. Two planets orbiting a star 950 light-years from Earth are the smallest, most Earth-size alien worlds known, astronomers announced today (Dec. 20). One of the ...

[Photo: NASA/Ames/JPL-Caltech] The Kepler space telescope must be NASA’s most prized possession right now. A few weeks ago, it found several possibly habitable planets in distant solar systems; now it ...

Just two weeks after the confirmation of a planet that's within the habitable zone of a distant star, the Kepler team is back with the discovery of two Earth-sized planets orbiting in what is now a ...

Other distant planets found before have been too large for possible life. Dec. 20, 2011 — -- NASA's Kepler space telescope has found two new planets orbiting a distant sun-like star, and the ...