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Two Worlds Orbiting A Nearby Star Could Be More Than Half Water
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A cross-sectional diagram comparing Kepler-138d to Earth. (Benoit Gougeon, Université de Montréal)Transit data show Kepler-138c and Kepler-138d have radii 1.51 times that of Earth, and measures of their respective tugs on Kepler-138 give us masses of 2.3 and 2.1 times that of Earth, respectively.
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