File:Gliese 581 Artist's impression.jpg

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Image title	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. The Gliese 581 planetary system now has four known planets, with masses of about 1.9 (planet e, left in the foreground), 16 (planet b, nearest to the star), 5 (planet c, centre), and 7 Earth-masses (planet d, with the bluish colour). The planet furthest out, Gliese 581d, orbits its host star in 66.8 days, while Gliese 581 e completes its orbit in 3.15 days.
Credit/Provider	ESO/L. Calçada
Source	European Southern Observatory
Short title	Artist's impression of the newly discovered planetary system Gliese 581
Usage terms	Creative Commons Attribution 3.0 Unported license
Date and time of data generation	00:00, 21 April 2009
Keywords	Gliese 581
Contact information	http://www.eso.org/ Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany