Gliese 581g (also known as Zarmina)
Gliese 581g (also known as Zarmina) is 20 light years away from us in the constellation Libra. Astronomers used the HIRES spectrometer on the Keck I Telescope to observe the Giliese system. For a while it was known as the potentially habitable “second Earth”, though some astronomers questioned its very existence. Now Gliese 581g is back on the list of exoplanets considered prime candidates for harbouring life – along with another planet orbiting the same star. Gliese 581g was discovered by astronomers of the Lick-Carnegie Exoplanet survey in 2010, but subsequent surveys were unable to detect it.
Gliese 581g has a mass three to four times that of Earth and receives a similar amount of sunlight that Earth does. It orbits a red dwarf every 37 days and resides within that sun’s habitable zone. It is tidally locked to the star, which means that one side is always facing the star and has perpetual sunlight, while the other side is perpet
ually dark.Gliese 581g is the most Earth-like planet known within the Earth Similarity Index, which is a measure of Earth-likeness from zero to one. Gliese 581g scores 0.92 on the Earth Similarity Index; the next top candidate is Gliese 667Cc. Other planets suspected of harboring life include Kepler-22b (https://www.facebook.com/