The first two Earth-sized exoplanets, Kepler-20e and Kepler-20f, are depicted here compared to Earth and Venus. Scientists think Kepler-20f could have an atmosphere, but suggest that extremely hot conditions on Kepler-20e would have evaporated any atmosphere.
http://www.sciencenews.org/view/generic/id/337052/description/First_Earth-sized_planets_netted
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