Gliese 581 c adalah sebuah planet ekstrasurya yang mengorbit bintang katai merah Gliese 581. Kemungkinan planet ini berada pada zona layak huni, di mana suhu permukaannya mengizinkan adanya air. Planet ini berjarak 20,4 tahun cahaya (193 triliun km) dari Bumi dan terletak di rasi bintang Libra. Gl 581, atau Gliese 581, merupakan bintang ke 581 dalam urutan Katalog Gliese. Katalog tersebut dibuat oleh Gliese, diterbitkan pada tahun 1969 dan diperbaharui tahun 1991 oleh Gliese dan Jahreiss.
http://id.wikipedia.org/Gliese_581_C
Gliese dan bintangnya
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As we approach the planet Gliese 851c, its parent star looms nearly a dozen times bigger than our sun appears from Earth. An inner planet about as big as Neptune transits the solar disk, close enough to show significant detail without a telescope.
If the planet is tidally locked, with the same face turned permanently toward its sun, any ocean near the subsolar point would likely simmer under a perpetual haze of steam. Weather patterns might tend to radiate from this equatorial teakettle.
The extrasolar planet Gliese 581c is slightly larger than earth and orbits in the habitable zone of its star. The "Twilight Zone" near the boundary between day and night might afford a temperate climate. The sun would be fixed in place near the horizon, however, and plants might tend to grow in waves, struggling for sunlight, with fallow regions in the shadowlands between crests of forest vegetation. Digital artwork copyright 2008 Don Dixon / cosmographica.com
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