Puffy Planet
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August 26, 2010 An artist's concept shows the atmosphere of a planet known as HD209458b boiling away into space, as seen from a hypothetical moon. The planet and star are so close together that winds and radiation from the star are stripping away the planet's atmosphere. The star's energy and the planet's own magnetic field are also causing the planet to puff up like a big balloon. [NASA/ESA/G. Bacon (STScI)]
