An astronaut on the robotic arm of the shuttle carries the COSTAR instrument for installation whil another works in the cargo bay.

Astronauts Kathryn Thornton and Thomas Akers in Payload Bay to install COSTAR

Kathryn C. Thornton lifts the Corrective Optics Space Telescope Axial Replacement (COSTAR) on STS-61 prior to its installation into the Hubble Space Telescope. Thornton is anchored to a foot restraint on the end of the Remote Manipulator System arm. Crewmate Thomas D. Akers, assisting in the COSTAR installation, is at the lower left.

Credits: NASA