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  1. NASA's Kepler Mission Discovers Its Smallest Habitable Zone Planets

    NASA's Kepler Mission Discovers Its Smallest Habitable Zone Planets

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  3. Scientists Discovered Planets Even Better for Life Than Earth

    Scientists Discovered Planets Even Better for Life Than Earth

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  4. Scientists Discovered Planets Even Better for Life Than Earth

    Scientists Discovered Planets Even Better for Life Than Earth

    21