View Full Version : New Rocky Exoplanet Discovered; Just Twice as Massive as Earth

2009-Apr-21, 02:10 PM
Another extrasolar planet has been found in the very interesting Gliese 581 system, and this one is the lightest, or least massive exoplanet yet discovered. Planet “e” in the system is only about twice the mass of our Earth. Gliese 581 e orbits its host star located only 20.5 light-years away in [...]

More... (http://www.universetoday.com/2009/04/21/new-rocky-exoplanet-discovered-just-twice-as-massive-as-earth/)