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NASA astronauts Michael J. Massimino (on the end of Space Shuttle Columbia's robotic arm) and James H. Newman (Massimino's right) during extravehicular activity (EVA, or space walk) to service the Hubble Space Telescope (HST). This space mission, STS-109, was the fourth servicing of the HST. Photographed on 5th March 2002. (KEYSTONE/SCIENCE PHOTO LIBRARY/NASA/SCIENCE PHOTO LIBRARY)