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First 'Earth-Size Planets Beyond Our Solar System' Discovered

A NASA illustration comparing the newly discovered planets to Venus and Earth. Kepler-20e is slightly smaller than both Venus and Earth. Kepler-20f is slightly larger. (NASA/Ames/JPL-Caltech)
A NASA illustration comparing the newly discovered planets to Venus and Earth. Kepler-20e is slightly smaller than both Venus and Earth. Kepler-20f is slightly larger. (NASA/Ames/JPL-Caltech)

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