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GREAT NEIGHBORS

This diagram shows the position of the four planets in the Gliese 581 system. The newly found, innermost body is Gliese 581 e, the smallest exoplanet yet discovered. The habitable zone (blue region), where water could exist as a liquid, clearly includes the outermost planet, Gliese 581 d. Credit: IMAGE: ESO, based on a diagram by F. Selsis/Univ. of Bordeaux

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