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Astronaut Andrew Feustel, perched on the end of the robotic arm, helps to install the Wide Field Camera 3 (WFC3) during a May 14, 2009, spacewalk to perform work on the Hubble Space Telescope. Wide Field Camera 3 is one of two new instruments installed during Servicing Mission 4, the fifth astronaut visit to Hubble.

Hubble Mission, Observatories, Photographs