An astronaut on th end of the robotic arm with many tools attached to a workstation and a large blue earth in the background.

Astronaut Jeffrey Hoffman during Third of Five Hubble Space Telescope Extravehicular Activities

Jeffrey A. Hoffman signals directions to European Space Agency (ESA) astronaut Claude Nicollier, as Nicollier controls the Remote Manipulator System arm during the third of five extravehicular activities of the Hubble Space Telescope's first servicing mission in December 1993.

Credits: NASA