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Astrobiology

Kepler Zeroes in on Alien Earths

NASA's Kepler space observatory is finally achieving its goal of finding many Earth-size exoplanets with surface temperatures suitable for liquid water — and thus potentially habitable.

Spacecraft and Space Missions

Kepler Mission Gets Four More Years

NASA's incredibly successful planet-hunter has had its mission extended to 2016 — giving it extra time to find Earthlike worlds in Earthlike orbits.

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