Doubt cast on existence of habitable alien planet

[![Gliese 581g is thought to have three times the mass of Earth, and to orbit in the middle of its star’s habitable zone, meaning liquid water could exist on the planet’s surface. ][1]][2]Last month, astronomers announced the discovery of the first potentially habitable extrasolar planet. But this week at an International Astronomical Union meeting, doubts were raised about the existence of this exciting new planet said to be orbiting the star Gliese 581.

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