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Title
Lightest Exoplanet Yet Discovered.
Abstract
The article reports on the discovery of the lightest exoplanet by researcher Michel Mayor of the Geneva Observatory in Switzerland. The planet called "e" in the famous system Gliese 581, is twice the mass of the Earth and was first discovered in 2007 in the habitable zone. Xavier Bonfils from Grenoble Observatory, reveals that the exoplanet has only 1.9 Earth masses is likely to be a rockey planet.