no its too hot
Gliese 581 IS the system, D is the planet.
Gliese 581 c is too hot for life because it is closer to its star. This planet is similar to venus. This planet traps too much heat that causes a strong greenhouse effect. The temperature is too high and the atmosphere is nearly all carbon dioxide. Gliese 581 d is at the right distance for liquid water to exist. It is at the Goldilocks zone just like the earth. That means life could exist on Gliese d. This planet have the right temperature. It has a magnetic field and a rich oxygen and nitrogen atmosphere.
3-6. The 3 planet model would have gliese 581 b too hot, gliese 581 c in the habitable zone, and gliese 581 d too cold. The 6 planet model would have gliese 581 e, b, and c too hot, gliese 581 g and d in the habitable zone, and gliese 581 f too cold.
5x the mass of earth
There are planets that are good candidates. There called Gliese 581 c and Gliese 581 d, they orbit a red dwarf 20.3 light years away. And they are thought to have an atmosphere and a temperature in which water may exist, and may also be in the "Goldilocks Zone."
d = a - b, a = 876, b = 1175 - 876 ie 299 876 - 299 = 577. Easier : 876 x 2 = 1752, 1752 - 1175 = 577
The discovery of Gliese d a habitable planet
We know literally nothing about either planet except their orbital periods and minimum masses. Really all there is to be said is that they both orbit the same star.
No, but there is one called Gliese 581 dSee related link for more information.
=D
Answer:Titan, which is one of Saturn's moons, also ( just in case you want to know) Pluto is not a planetAnswer:We shouldn't forget the extra solar planets (see WikiPedia Article: Extra Solar Planets):The first discoveries were:* Pulsar planets around PSR B1257+12. * A "Hot Jupiter" arounf 51 PegasiThen the following (by year)* 1996, 47 Ursae Majoris b * 1998, Gliese 876 b * 1999, Upsilon Andromedae (hree Planets) * 1999, HD 209458 b * 2001, HD 209458 b * 2001, Iota Draconis b * 2003, PSR B1620-26 b * 2004, Mu Arae c * 2004, 2M1207 b * 2005, Gliese 876 d * 2005, HD 149026 b * 2006, OGLE-2005-BLG-390Lb * 2006, HD 69830 (Three Planets) * 2007, HD 209458 b and HD 189733 b * 2007, Gliese 581 c2007, Gliese 436 b * 2007, XO-3b 2007, TrES-4 * 2008, OGLE-2006-BLG-109Lb and OGLE-2006-BLG-109Lc * 2008, HD 189733 b * 2008, HD 40307:
No other planet in our solar system could support advanced life such as on Earth. Others could support UNintelligent life. Planets in other galaxies that may support life are: OGLE-2005-BLG-390Lb , Gliese 581 c, and Gliese 581 d.