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Discovery of Earth-like Planet

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Astronomers have announced the discovery of the most Earth-like planet ever found outside our solar system. The alien world dubbed Gliese 581g (depicted in the image), which is 20 light years away, is thought to be situated in the "Goldilocks zone," just the right distance from its sun for water to form. More here.

Artist's Impression: Zina Deretsky, National Science Foundation/AP

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