It may be possible. This exosolar planet, three to four times the size of Earth and 20 light years away, is thought to be in the right place in relation to the sun - in the middle of the `habitable` zone. If it has a rocky surface, then liquid water may be abundant on the surface. It is the closest planet found so far to that of Earth.
Gliese 581 g was discovered on September 29, 2010.
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.
No. g liese 581c is a planet that orbits a star, Gliese 581.
Because Gliese 581 g, if it exists, is located near the middle of the habitable zone (or Goldilocks zone - [See related question]) of its parent star.
Goldilocks Zone or Goldilocks Planet.
January 12th 2017
Otherwise known as Zarmina's world, Gliese 581 G is apparently of the condition to sustain life. It is an estimated 20.3 light years away. It orbits around a red dwarf called Gliese 581. For more info check out the related link
20.5 Light Years away from Earth.
Gliese itself does not exist, but Gliese 581 is a red star.
It is a planet only about 3 times the mass of Earth orbiting in the habitable zone of the star Gliese 581. It is widely considered the most likely extrasolar planet to harbor life.
The most likely candidates are (in no order): Gliese 581 g, HD 40307 g, Gliese 163 c, Gliese 581 d, Tau Ceti e, Gliese 667C c, Kepler 22 b, HD 85512 b and Tau Ceti f
No. At 20.5 light years from Earth, and it only having been discovered, AND Terrans not having developed extra-light speed craft or wormhole technology, it would not be possible for anyone to have arrived at Gliese 581 G yet.