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This graphic shows the data confirming the existence of extrasolar planet HD 156668b as discovered using Keck/HIRES. The planet

News | 01.08.2010

Second smallest exoplanet found to date discovered at Keck

Planet hunters using Keck Observatory have detected an extrasolar planet that is only 4 times the mass of Earth. The planet is the second smallest exoplanet ever discovered and adds to astronomers' growing cadre of low-mass planets called super-Earths...

 Astronomy

Image Credits: (header) European Space Agency & NASA; (left) Andrew Howard, UCB ; (background) NASA, ESA and H.E. Bond (STScI)

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