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Associated Press
In this image provided by SpaceX, the Dragon capsule uses parachutes to descend to the Pacific Ocean off the coast of Mexico's Baja Peninsula after leaving the International Space Station. The vehicle brought back more than 1 ton of science experiments and old station equipment. It's the only supply ship capable of two-way delivery. NASA is paying SpaceX more than $1 billion for a dozen resupply missions. (AP Photo/SpaceX)

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