The discovery of Gliese 581 was one of the most exciting moments in extrasolar planetary researcher. Its average distance from the Gliese 581 star is about 0.041 AU.

Gliese 581d has a mass of around 7 to 8 times that of Earth, its radius is thought to be around twice that of Earth. Gliese 581d orbits a red dwarf, the star has a mass of around one third of the sun. Scientists say this planet is also terrestrial and it also contains an atmosphere. Astronomers (scientists who study space) have discovered some planets that orbit Gliese 581. Rocky world in third.

It resides in the Gliese 581 system, which at 20 light-years from Earth is relatively close to our planet (in celestial terms). Gliese 581c comes next. The orbits of planets in the Gliese 581 system are compared to those of our own solar system. Comparing the Gliese 581 to Our Solar System. So one year on Gliese 581g equals to 37 earthly days. Astronomers found an Earth-massed planet orbiting within the habitable zone of a distant star. Gliese 581 After more than four years of observations using the most successful low-mass exoplanet hunter in the world, the HARPS spectrograph attached to the 3.6-metre ESO telescope at La Silla, Chile, astronomers have discovered in this system the lightest exoplanet found so far: Gliese 581e (foreground) is only about twice the mass of our Earth. It is also known as HO Librae, GL 581, or GJ 581.

Gliese 581d is the third planet from its host star in the Gliese 581 system, or the fifth planet if you include two unconfirmed planets. Gliese 581 is an M-class red dwarf star that is not far from the Earth.It is 22 light years away from the Solar system. It is a newly founded planet of Gliese 581 planetary system, discovered on September 29, 2010, by radial velocity method and it is around 4 times massive as earth. Gliese 581c is a super-Earth planet that was discovered in 2007. The fourth one out (Gliese 581 g) is thought to be the most Earth-like planet found so far, if it were to be a rocky planet.

This makes it the 89th closest known star to the Sun. Gliese 581g completes its orbit around the habitable zone of Red dwarf in about 37 days. The Gliese 581 star has about 30% the mass of our sun, and the outermost planet is closer to its star than we are to the …