Photo: Greenhouse Effect May Expand Habitable Planet Roster

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An artist's impression shows the red dwarf star Gliese 581 and its three known planets.

A new study suggests that Gliese 581 d (farthest planet, center) may still be warm enough to have liquid water—even though it is not in an ideal orbit—because of greenhouse gas warming.

Illustration courtesy European Organisation for Astronomical Research in the Southern Hemisphere

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