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Space Missions

Kepler Goes Down — and Probably Out

NASA's revolutionary planet-hunting spacecraft suffered malfunction this week that leaves it unable to point precisely at its target stars.

Space Missions

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.

Stellar Science

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.