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Message: <blockquote data-quote="Core" data-source="post: 7560031" data-attributes="member: 263471">NOTE: READ THE RED HIGHLIGHTED TEXTS VERY CAREFULLYGliese 581 d or Gl 581 d  is an extrasolar planet orbiting the  star Gliese  581 approximately 20 light-years  away in the constellation of Libra. Because of its mass, between 7  and 14 times that of Earth, the planet is classified as a super-Earth.  In late April 2009, new observations by the original discovery team  concluded that the planet is within the habitable zone where liquid water may exist.<img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" />On average, the light that Gliese 581 d receives from its star has about  30% of the intensity of sunlight on Earth. By comparison, sunlight on  Mars has about 40% of the intensity of that on Earth. That might seem to  suggest that Gliese 581 d is too cold to support liquid water and hence  is inhospitable to life. However, an atmospheric greenhouse effect can  significantly raise planetary temperatures. For example, Earth's own  temperature would be about -18°Cwithout any greenhouse gases. If the atmosphere of Gliese 581 d  produces a sufficiently large greenhouse effect, then the surface temperature  might well permit liquid water and the planet might conceivably support  life.In October 2008, members of the networking website Bebo beamed A Message From Earth, a high-power transmission  at Gliese 581, using the RT-70 radio telescope belonging to the National Space Agency of  Ukraine. This transmission is due to arrive in the Gliese 581  system's vicinity by the year 2029; the earliest possible arrival for a  response, should there be one, would bein 2049.<img src="/styles/default/xenforo/smilies/default/rofl.gif"  class="smilie" loading="lazy" alt=":rofl:" title="ROFL    :rofl:" data-shortname=":rofl:" /> it means if we got the response then we have another Race that will be called "Gliese Race"Note that though there is another planet in the same solar system which is called Gliese 581 C that's not in habitable zone which means no water in liquid stateGliese 581 C  between 7  and 14 times that of Earth<img src="http://upload.wikimedia.org/wikipedia/commons/e/e9/Gliese_581_d-v1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Gliese 581 C maybe a rocky planet and suspected to be a planet like earth but not in the Habitable Zoneeven though it's not in Habitable Zone there maybe a possibilitybut the situation is unclear. conclude that Gliese 581 c is likely to suffer from a runaway  greenhouse effect similar to that found on Venus, as such, is highly unlikely to be  habitable. Nevertheless, this runaway greenhouse effect could be  prevented by the presence of sufficient reflective cloud cover on the  planet's day side.  Alternatively, if the surface were covered in ice, it would have a high  albedo  (reflectivity), and thus could reflect enough of the incident sunlight  back into space to render the planet too cold for habitability, although  this situation is expected to be very unstable except for very high  albedos greater than about 0.95 (i.e. ice): release of carbon dioxide by volcanic activity or of water vapor due  to heating at the substellar point would trigger a runaway greenhouse  effect. Gliese 581 C is Suspected to be like this<img src="http://upload.wikimedia.org/wikipedia/commons/f/f5/Gliese_581_c.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

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