It’s a Small World: Kepler Spacecraft Discovers First Known Earth-Size Exoplanets

NASA's Kepler spacecraft is starting to put the pieces together in its search for virtual Earth twins in other planetary systems. Kepler, which launched in 2009 , is on the lookout for planets that are about the size of Earth and have temperate surface conditions.

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It’s a Small World: Kepler Spacecraft Discovers First Known Earth-Size Exoplanets