French scientists have confirmed, using a computer model that Gliese 581 d, a planet orbiting a red dwarf star 20 light-years from Earth, has a stable atmosphere, comfortable temperatures and liquid water on its surface. It is the first planet discovered by us, which revolves around another star and may support life, staying practically next door to us.
Although Gliese 581 d is too small and is from us at such a distance that does not allows direct observation, we can judge it by the gravitational effects it is having on neighboring planets and their home star. On the basis of such indirect methods, the scientists concluded that the size of Gliese 581 d is approximately two times the size of Earth (and its mass is more than six times the Earth), is solid (not a gas giant like Jupiter or Saturn). This means that its size and the density can be the atmosphere. You can calculate how much energy is Gliese 581 d receives from its star. On the basis of all this information, the French scientists have calculated the possible range of climates, and their calculations showed that the "Gliese 581 d has a stable atmosphere and liquid water on its surface in a wide range of possible options."
Since we are talking about the planet, which is located at 189 210 568 million kilometers from us, it is difficult to draw any final conclusions, but by the model can predict the most probable situation. But this does not mean that there will be a haven of life. On Gliese 581 d, probably warm climate supports a pronounced greenhouse effect, because the energy of the red dwarf comes not so much. The atmosphere consists essentially of CO2. Although there are clouds, rain and oceans, the surface will be dominated by "persistent red twilight."
Despite that, this place - the ideal candidate to search for alien plant life. And if there are plants that can be animals that have adapted to the strong gravity, a small amount of light and oxygen. Therefore, it will be low, and small, large eyes. And, of course, a potential life can develop in warm oceans.
Although, in galactic terms, 20 light-years away - it is very close, with the help of existing technologies, we can get there only 300,000 years old. A more appropriate option may be interstellar probe that can reach Gliese 581 d in a few centuries.