Discovered planet considered as potentially habitable

One of the planets that revolve around the star Gliese 581 dwarf could be "habitable" with climate conducive to the existence of liquid water and life, according to a study that a team of climate scientists has just published.
Astronomers want to determine whether any of the 500 exoplanets discovered are able to harbor life.
Seven times more massive than Earth and apparently rocky, the Gliese 581d "could be the first potentially habitable planet 'discovered until today, announced the French National Centre for Scientific Research (CNRS) said in a statement.
Detected in 2007 to 20 light years from the solar system, Gliese 581d at the time was considered too cold to be 'habitable', that is, there would have temperatures consistent with the presence of liquid water on its surface.
The exoplanet that orbits around a star bit hot, a red dwarf, receives three times less energy compared to the Earth receives from the Sun is also possible that you always have the same face to its star, while the other remains in eternal darkness.
Despite the disadvantages, Gliese 581d might benefit from a greenhouse effect, which gives it a climate "hot enough to allow the formation of oceans, clouds and rain," according to a modeling shows that "the range of possible climate for the planets the galaxy, "added CNRS.
In this simulation, the team of Robin Wordworth and Francois Forget, the Laboratory of Dynamic Meteorology (LMD) at the Institute Pierre Simon Laplace in Paris, inspired by the models used to study the Earth's climate, expanding the range of possible conditions.
If you have a dense atmosphere of carbon dioxide (CO2), which is considered very likely by the exoplanet can prevent condensation of the atmosphere in your face at night and even have a warm climate.
After a phenomenon called "diffusion Rayleigh ', which gives the key to our blue sky, the earth's atmosphere into space reflects the large proportion of blue radiance, limiting the warming of our planet. An effect that is insensitive to the red, according to scientists whose work was published in the journal Astrophysical Journal Letters.
Gliese 581d, the third planet orbiting around the red dwarf, could be in a reddish haze, with a dense atmosphere and a thick nebula.