In an image from video provided by NASA, the SpaceX commercial cargo ship Dragon prepares to leave the International Space Station on Sunday, May 18, 2014. The Dragon capsule was bringing back 3,500 pounds of gear, with splashdown planned in the Pacific Ocean, about 300 miles offshore from Mexico's Baja California peninsula. It's the only supply ship capable of safely returning items. The astronauts released it using the International Space Station's big robot arm. (AP Photo/NASA)
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