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Astronomers have discovered the smallest planet outside our solar system, and the first that is undoubtedly rocky like Earth. Measurements of unprecedented precision have shown that the planet, Kepler 10b, has a diameter 1.4 times that of Earth, and a mass 4.6 times higher. However, because it orbits its host star so closely, the planet could not harbour life. The discovery has been hailed as "among the most profound in human history".
Originally posted by ALadInsane
reply to post by backinblack
I think the story is built around the fact that it is the first rocky planet discovered outside of our Solar System, hence the milestone tag.