COSMIC SECRETS
Extra Solar Planets
New Planets Discovered
Gliese 581 d
A planet in the habitable zone
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Image credit:  Based on a diagram by Franck Selsis, Univ. of Bordeaux. ESO
By refining the orbit of the planet Gliese 581 d, first discovered in 2007, a team of astronomers has shown that it lies well within the habitable zone, where liquid water oceans could exist. This diagram shows the distances of the planets in the Solar System (upper row) and in the Gliese 581 system (lower row), from their respective stars (left). The habitable zone is indicated as the blue area, showing that Gliese 581 d is located inside the habitable zone around its low-mass red star.
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