Gliese 581d Life

The orbital distance places it at the outer limits of the habitable zone, the distance at which it is believed possible for water to exist on the surface of a planetary body. At the time of its discovery, the planet’s orbit was originally thought to be farther out. However, in late April 2009 the original discovery team revised its original estimate of the planet’s orbital parameters, finding that it orbits closer to its star than originally determined with an orbital period of 66. 87 days. They concluded that the planet is within the habitable zone where liquid water could exist, thus confirming previous studies. Moreover, the data also suggested that the proposed exoplanet could have at least one or more large oceans.

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