Gliese 581 g (pronounced /??li?z?/), also Gl 581? g or GJ 581? g, is an extrasolar planet of the red dwarf star Gliese 581, 20.5 light-years from Earth in the constellation of Libra.[3] It is the sixth planet discovered in the Gliese 581 planetary system and the fourth in order of increasing distance from the star. The discovery was announced by the Lick-Carnegie Exoplanet Survey in late September 2010, after a decade of observation. However, according to one recent study the planet may be "unlikely" to exist.[2]
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