NOTE: READ THE RED HIGHLIGHTED TEXTS VERY CAREFULLY
Gliese 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.
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.
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 state
Gliese 581 C between 7 and 14 times that of Earth
Gliese 581 C maybe a rocky planet
and suspected to be a planet like earth but not in the Habitable Zone
even though it's not in Habitable Zone there maybe a possibility
but 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
Gliese 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.
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.
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 state
Gliese 581 C between 7 and 14 times that of Earth
Gliese 581 C maybe a rocky planet
and suspected to be a planet like earth but not in the Habitable Zone
even though it's not in Habitable Zone there maybe a possibility
but 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
now get a life!
man dan site ekata giya dan dakke thawa 19yrs inna one ne 
