Gliese 581 is a cool and dim, main sequence red dwarf (M2.5 V). It is also known as HO Librae, GL 581, or GJ 581.. Astronomers have discovered some planets that orbit Gliese 581. It is 22 light years away from the Solar system. The planet is classed as a Super Earth, exoplanets which have up to 10 times the mass of our own planet. This planet has a mass of about 6.25 Earths and a diameter of about 4 times that of Earth. Astronomers have discovered some planets that orbit Gliese 581. Its mass is 5 times that of Earth, and its diameter is the same as that of Earth. It is tidally locked (always presents the same face to its primary) so if life had a chance to emerge, the best hope of survival would be in the "terminator zone". Gliese 581 b, planet, semi-major axis: 0.0406±0.0000 AU 1.2. The large planet in the foreground is the newly discovered GJ 581g, which has a 37-day orbit right in the middle of the star's habitable zone and is only three to four times the mass of Earth, with a diameter 1.2 to 1.4 times that of Earth. It was discovered in April 2007. In any case, even in the case of 1:1 tidal lock, the planet would undergo libration and the terminator would be alternatively lit and darkened during libration. It is not so large as to be a gas giant like any of our Solar System's outer planets. This is a region around a star where the surface temperature of a planet is suitable for liquid water. (note: this probably differs from its surface temperature). They found that 581b weighs 16.6 times as much as the Earth, and that its orbit around GL 581 lasts for 5.366 days. The astronomers agree that four of the planets are real, but some think there are two more planets. in the Gliese 581 system; namely, Gl 581c with a mass of 5.06 M ⊕ and a semi-ma jor axis of 0.073 AU, and Gl 581d with 8.3 M ⊕ and 0.25 AU. Gliese 581c, la dernière découverte, tourne en 13 jours seulement à une distance de 11 millions de kilomètres (contre une moyenne approximative de 150 millions de km pour la Terre. This planet lies at the inner edge of Gliese … If it is around the minimum mass, and its composition is similar to that of the earth, its diameter would be only about 50% more than Earth's. The mass of the planet cannot be very much larger than this or the system would be dynamically unstable Gliese 581c is a super-Earth planet that was discovered in 2007. On the other hand, it could just be a small gas giant. With a mass at least 5.5 times that of the Earth, it is classified as a super-Earth (a category of planets with masses greater than Earth's up to 10 Earth masses). highly unlikely life would be able to exist on the planet. A slow rotation rate approximately 117 times slower than Earth's produces prolonged days and nights. Gliese 581c is the most Earth-like alien planet yet discovered. , The new research suggests that the rocky centres of super-Earths are unlikely to evolve into terrestrial rocky planets like the inner planets of the Solar System because they appear to hold on to their large atmospheres. The star has almost a third (31 +/- 2 percent) of Sol's mass, as small as 29 percent of its diameter (Chabrier and Baraffe, 2000; Pasinetti-Fracassini et al, 2001; and Johnson and Wright, 1983), and a bit more than one percent (around 0.0135) of its bolometric luminosity (Vogt et al, 2010; Bonfils et al, 2005, in pdf). For example, if Gliese 581c is a rocky planet with a large iron core, it should have a radius approximately 50% larger than that of Earth, according to Udry's team. Gliese 581c is 1.5 times Earth's diameter and five times its mass, and it lies in the star's habitable zone. The planet was discovered in 2007 using the radial velocity method of detection. If it is around the minimum mass, and its composition is similar to that of the earth, its diameter would be only about 50% more than Earth's. In late 2010, US astronomers annoucent a planet in … 5 ; Gliese 581 g . The signal will reach the planet Gliese 581c in early 2029. Gliese 581c is the most Earth-like alien planet yet discovered. from the OMIGOSH-it-must-be-accurate! After this study was published, more scientists started to look for other planets tha… A typical radius for an M0 star of Gliese 581's age and metallicity is 0.00128 AU, against the sun's 0.00465 AU. 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