NASA astronaut Mike Hopkins participates in the second of two spacewalks orbiting International Space Station.

NASA astronaut Mike Hopkins, Expedition 38 flight engineer, participates in the second of two spacewalks, spread over a four-day period, which were designed to allow the crew to change out a faulty water pump on the exterior of the Earth orbiting International Space Station. He was joined on both spacewalks by NASA astronaut Rick Mastracchio, whose image shows up in Hopkins' helmet visor.