sentences:  The density estimate obtained for COROT-7b points to a composition including rocky silicate minerals, similar to the four inner planets of the Solar System, a new and significant discovery.COROT-7b, discovered right after HD 7924 b, is the first super-Earth discovered that orbits a main sequence star that is G class or larger.The discovery of Gliese 581e with a minimum mass of 1.9 Earth masses was announced on 21 April 2009.