The French-led Corot planet-finding satellite has discovered its first Earth-size planet, and the first outside the Solar System to be observed directly as it transited in front of its star. The finding, known for a year but only recently confirmed, was announced at a symposium in Paris on Feb. 3. It is the latest of a series of startling discoveries since Corot was launched in December 2006 (AW&ST Jan. 14, 2008, p. 49). The new planet, known as Corot-Exo-7b, is less than twice the size ...

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