Astronaut with Solar Maximum Satellite, 1984.
© National Aeronautics & Space Administration / Science & Society
The astronaut is using an MMU (Manned Manoeuvring Unit) allowing him to reach damaged satellite without being tethered to the orbiter. During Shuttle mision 41-C, launched on 6th April 1984, astronauts George Nelson and James van Hoften captured the Solar Maximum Satellite that had failed in orbit four years before, taking it back to Challenger where they repaired and released it again. This was the first repair of a satellite in space.