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An artist's conception of the Kepler-20 planetary system, with its five planets, including two Earth-sized planets. All five orbit their star closer than the planet Mercury in our solar system. Although too hot to be hospitable to life, Kepler-20e and -20f are the first Earth-sized planets to be discovered orbiting a distant star.
Credit: David A. Aguilar, CfA
Low Resolution Image (jpg)
Credit: David A. Aguilar, CfA
Low Resolution Image (jpg)
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