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NASA's Kepler Provides Insights on Enigmatic Planets

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Kepler space telescope

Artist's concept of NASA's Kepler space telescope.

Credit: NASA/JPL-Caltech

More than three-quarters of the planet candidates discovered by NASA's Kepler spacecraft have sizes ranging from that of Earth to that of Neptune, which is nearly four times as big as Earth.

From Jet Propulsion Laboratory/NASA
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