MS Peterson and MS Musgrave in payload bay (PLB) during EVA

STS006-10-417 (7 April 1983) --- Astronauts F. Story Musgrave, left, and Donald H. Peterson float about in the cargo bay of the Earth-orbiting space shuttle Challenger during their April 7, 1983, extravehicular activity (EVA). Their "floating about" is restricted via tethers to safety slide wires. Thanks to the tether/slide wire combination, Peterson is able to translate along the port side hand rails. Musgrave is near the Airborne Support Equipment (ASE) for the now vacated Inertial Upper Stage (IUS). Clouds can be seen in the background. Photo credit: NASA