Stock Photo - The SpaceX Dragon craft is poised and ready to be released from the International Space Station on May 21, 2015. This was SpaceX's sixth resupply mission to the space station and returned about 3,100 pounds of experiment samples and equipment back down to Earth.

Stock Photo: The SpaceX Dragon craft is poised and ready to be released from the International Space Station on May 21, 2015. This was SpaceX's sixth resupply mission to the.

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