Two Hubble astronauts working during Servicing Mission 4. One of the astronauts is carrying a large silver box, about the size of a telephone booth. He is standing on the long robotic CANADARM, to his left there is another astronaut, sideways and working inside Hubble, which has two giant bay doors open at the bottom.

Hubble SM4 Astronauts moving COSTAR

Astronaut Andrew Feustel, positioned on the Manipulator Foot Restraint, moves the Hubble Space Telescope Corrective Optics Space Telescope Axial Replacement (COSTAR) during the third SM4 spacewalk. Astronaut John Grunsfeld is visible working behind the door.

Credits: NASA
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