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Astronaut Andrew Feustel, positioned on a foot restraint on the end of Atlantis' robotic arm, participates in Servicing Mission 4's third spacewalk on May 16, 2009. Over the six-hour, 36-minute spacewalk, Feustel and Astronaut John Grunsfeld removed the Corrective Optics Space Telescope Axial Replacement, installed the new Cosmic Origins Spectrograph, and worked to repair the Advanced Camera for Surveys.

Hubble Mission, Observatories, Photographs