Changes

The planet is calculated to have at least 5.36 times [[Earth|Earth’s]] mass (maximum of 10.4 times), and is estimated to be 1.5 times the [[Earth|Earth’s]] diameter.  The planet orbits with a mean distance of only 0.07 AU, which takes just under 13 days to complete.  At this distance, Gliese 581 c is [[tidal lock|tidally locked]] to its parent star.<ref name="exo"/>

The planet is calculated to have at least 5.36 times [[Earth|Earth’s]] mass (maximum of 10.4 times), and is estimated to be 1.5 times the [[Earth|Earth’s]] diameter.  The planet orbits with a mean distance of only 0.07 AU, which takes just under 13 days to complete.  At this distance, Gliese 581 c is [[tidal lock|tidally locked]] to its parent star.<ref name="exo"/>

Initially the planet was thought to be inside Gliese 581’s [[habitable zone]], making it the first such terrestrial world outside of our Solar System to be found. This generate speculation about the possibility of the planet being suitable for life as we know it.  However, further research indicated that the planet may be too close to the [[star]], thus causing a [[Venus]]-like runaway greenhouse effect in its [[atmosphere]] that would boil off any [[water]].<ref name="habit">http://arxiv.org/PS_cache/arxiv/pdf/0705/0705.3758v1.pdf</ref>  Gliese 581 d instead is the better candidate for habitability.

Initially the planet was thought to be inside Gliese 581’s [[habitable zone]], making it the first such terrestrial world outside of our Solar System to be found. This generate speculation about the possibility of the planet being suitable for life as we know it.  However, further research indicated that the planet may be too close to the [[star]], thus causing a [[Venus]]-like runaway greenhouse effect in its [[atmosphere]] that would boil off any [[water]].<ref name="habit">https://arxiv.org/PS_cache/arxiv/pdf/0705/0705.3758v1.pdf</ref>  Gliese 581 d instead is the better candidate for habitability.

===Gliese 581 d===

===Gliese 581 d===