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This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?

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NASA's best exoplanet hunter is limping into retirement.

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The Kepler space telescope has discovered more than 130 exoplanets in our galaxy.

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But it will seek new worlds no more.

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Kepler relies on a set of four flywheels to stabilize its pointing and lock onto its target stars.

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The spacecraft was designed to tolerate one broken wheel, but not two.

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One gave out last year, and this May the really bad news arrived, a second wheel had failed.

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The Kepler team says they can't revive the wheels.

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So astronomers will rely on ground-based telescopes to look for other worlds until NASA's next planet hunter, the TESS satellite, launches around 2017.

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But don't send Kepler off into the sunset just yet.

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In an August 15th teleconference, NASA's Bill Borucki, the mission's principal investigator, noted that Kepler has loads of data that have yet to be fully searched for planets,

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including those Earth-like worlds that might host life:

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"So basically in the next two years, when we complete this analysis, we'll be able to answer the question that inspired the Kepler mission:

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Are Earths common or rare in our galaxy?"

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Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.

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