An Earth-size planet has been spotted orbiting a nearby star at a distance that would makes it not too hot and not too cold ? comfortable enough for life to exist, researchers announced today (Sept. 29).

If confirmed, the exoplanet, named Gliese 581g,  would be the first Earth-like world found residing in a star’s habitable zone ? a region where a planet’s temperature could sustain liquid water on its surface.

Odds of Life on Newfound Earth-Size Planet ‘100 Percent,’ Astronomer Says, 9/29/10

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