From Wired Science:
There’s finally proof that Earth-like planets can exist outside our solar system: Scientists have managed to measure the mass of exoplanet COROT-7b, revealing that it’s the first exoplanet with a confirmed density similar to our own.
“This is a day we’ve been waiting for for a long time,” said exoplanet researcher Sara Seager of the Massachusettes Institute of Technology, who was not involved in the research. “It’s the first definitive rocky world beyond our solar system, and it’s opening a new gate for our research. We’re really, really excited about it.”
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More News On The Discovery Of This Rocky Exoplanet
First rocky planet found outside solar system -- CNN
Scientists say "super-Earth" has rocky surface -- Reuters
Found: Firm place to stand outside solar system -- AP
Distant world 'has rocky surface' -- BBC
Solid evidence for Earthlike world -- Scientific America
COROT-7b: Earth-like planet discovered outside Solar System -- The Telegraph
Earth-like planet Corot-7b found outside solar system -- Times Online
Rock Solid Evidence of a Rocky, Earth-like Exoplanet -- Discover Magazine