The Kepler telescope with the mission to find other inhabitable planets has technical problems that make it unusable.
NASA informed that the Kepler spacecraft has technical issues and is unusable at the moment and might not be fixable. One of the three reaction wheels is not working and that means NASA cannot aim the Kepler telescope. This is not the first wheel that failed. Kepler already lost a reaction wheel in March.
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The Kepler spacecraft is in a safe-mode now. NASA will take the next several days and weeks to assess our options and develop new command products. These options are likely to include steps to attempt to recover wheel functionality and to investigate the utility of a hybrid mode, using both wheels and thrusters.
The big problem seems that Kepler is not made to be repaired by astronauts.
Kepler was though already a success even if it fails early. It launched 2009 and has found 2,740 potential earth-like planets.
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More details on NASA.