Sending probes and rovers to new moons and planets is exciting, but what about exploring worlds beyond our solar system? The Kepler Space Observatory has been looking for Earth-like exoplanets for over 3 years, and has turned up hundreds of so-called "Goldilocks" planets. The mission was scheduled to be discontinued this year, but this week, NASA announced it will be extended to 2016 due to its huge success.
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