FILE - This April 22, 2014 file photo provided by NASA shows a photo of the SpaceX Dragon spacecraft docked to the International Space Station and was photographed by one of two spacewalking astronauts. On Sunday, May 18, 2014, after a one-month visit, the SpaceX cargo ship was for return to Earth. The astronauts released it using the International Space Station’s big robot arm. (AP Photo/NASA, File)
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