Skylab repair spacewalks (1973)
Skylab lost a heat shield and a solar panel at launch. Astronauts Pete Conrad, Joseph Kerwin, and Paul Weitz ran risky spacewalks to free a jammed array and rig a sunshade, saving the station from overheating.
The crew restored power and cooling, making the station habitable.
The repairs proved humans could fix major hardware in orbit, a founding case for hands-on station upkeep.
Like the antenna swap, Skylab showed that a station's survival can hinge on astronauts fixing a single failing system by hand.
