Discovery crew completes third and final spacewalk

Perched on the end of the space station's fully extended robot arm, astronaut Ron Garan manually carried a 528-pound nitrogen tank from one side of the lab's main power truss to the other today, enjoying a spectacular there-and-back windshield-wiper ride that carried him eight stories above the research station.

Continue to Discovery crew completes third and final spacewalk on Spaceflight Now.

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