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Line 51: − − ==Old Universe View== − In the cosmological model of a billions of years old universe, astronomers have calculated the star to be between 2 and 4.3 billion years old,<ref name="exo">http://exoplanet.eu/star.php?st=Gl+581</ref> using measurements of Gliese 581’s kinematic characteristics and magnetic activity. More recent measurements of the star shows its brightness only varies slightly over time, suggesting it is even older.<ref>http://www.astronomy.com/asy/default.aspx?c=a&id=5619</ref>
→Old Universe View
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]].
[[Category:Astronomy]]
[[Category:Astronomy]]