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→Gliese 581 e: Changed extrasolar world to extrasolar planet, internal link is to an actual page now.
=== Gliese 581 e===
=== Gliese 581 e===
The discovery of '''Gliese 581 e''' was announced on April 21, 2009. The planet is estimated to have a minimum mass only 1.9 times that of Earth making it the smallest [[extrasolar world]] in the system and known overall. It is the closest of the four known worlds in distance from its parent star.
The discovery of '''Gliese 581 e''' was announced on April 21, 2009. The planet is estimated to have a minimum mass only 1.9 times that of Earth making it the smallest [[extrasolar planet]] in the system and known overall. It is the closest of the four known worlds in distance from its parent star.
The planet has a mean orbit of only 0.03 AU, which it completes in a mere 3 days. Because of its short distance, the planet is too close to be within Gliese 581’s habitable zone.<ref name="exo">http://exoplanet.eu/star.php?st=Gl+581</ref> It is unlikely to have an atmosphere because of the high temperatures and strong [[radiation]] it would receive at such a close distance to even a low mass [[star]].
The planet has a mean orbit of only 0.03 AU, which it completes in a mere 3 days. Because of its short distance, the planet is too close to be within Gliese 581’s habitable zone.<ref name="exo">http://exoplanet.eu/star.php?st=Gl+581</ref> It is unlikely to have an atmosphere because of the high temperatures and strong [[radiation]] it would receive at such a close distance to even a low mass [[star]].