In 1984, Challenger captured the failing SolarMax satellite; astronauts spent nearly seven hours repairing it before sending the observatory back to work

Forty years after "in-space servicing" emerged as a marketing pitch from multi-billion-dollar startup companies that were offering services for satellite fixing in space using drones, an attempt was made by five astronauts who hopped on the shuttle Challenger and performed a maneuver that none of the others had done before: they pulled a satellite out of orbit, repaired it manually, and returned it to its position. NASA's own retrospective on the mission confirms the April 1984 flight of STS-41C was designed exclusively to save a dying scientific satellite called SolarMax (short for the Solar Maximum Mission), which was on the verge of a total loss.

A2026 peer-reviewed paper titled “On-orbit servicing as a future accelerator for small satellites,” published in the journal npj Space Exploration, traces the entire modern industry of space services, including attempts to refuel satellites and debris removal from orbit, is said to have originated in that 1984 mission. That is what makes this story fascinating: a low-budget, rather haphazard 1980s space walk made possible today's orbital servicing economy.

A $240 million satellite crippled by a blown fuse


The SolarMax was no small satellite. It was launched in February 1980 for studying solar flares and was NASA's prime solar observatory satellite. It was also an unusually forward-looking machine: it flew on the Multi-Mission Modular Spacecraft bus, a spacecraft frame Goddard specifically designed so the shuttle could retrieve it and astronauts could swap out its major systems in orbit. That design choice would soon prove essential. In less than a year, a fuse in its attitude control system burned out, and by the time Challenger reached it in 1984, the satellite was limping along on backup magnetic sensors alone, unable to point precisely enough to use most of its instruments. The team controlling it from the ground was basically waiting for a tow truck, and that is when they brought Challenger into the picture.

The capture attempt that flopped on live television

This is the part that might get overlooked: the mission did not go well. Mission specialist George Nelson suited up into his jetpack-like Manned Maneuvering Unit and attempted to manually capture the spinning satellite. Not only did he fail, but he failed twice. The docking mechanism would not engage, and and his attempt instead knocked SolarMax into a faster tumble. The capture attempt was scrubbed as a flop.

NASA Mission Control had to formulate an entirely new strategy over the course of a single night; the following morning the astronauts resorted to using the robotic arm of the space shuttle, controlled by astronaut Terry Hart, to capture the satellite outright. This method may sound less glamorous but was extremely effective as it worked right out of the gate. The entire mission took a full day longer than expected as a result. It just goes to show how the "perfect astronauts" myth that NASA promotes is rarely so simple behind the scenes.

Nearly seven hours, two screws, and a spare part

Once SolarMax was finally secured in the cargo bay, the fixing of the satellite was nearly an anticlimax. The astronauts Nelson and James van Hoften spent six hours and 44 minutes outside on the actual repair spacewalk. Of that, just 45 minutes went to swapping out the faulty attitude control module, the part responsible for the whole crisis. Because the module was one of the bus's standard, designed-for-servicing components, van Hoften simply unscrewed two bolts, pulled it out, and slotted in the replacement.

The remaining hours went to the harder job: replacing the main electronics box on the satellite's coronagraph/polarimeter instrument. Unlike the attitude control module, this box was part of a specific science instrument, not the serviceable spacecraft bus, and, according to NASA's own account of the mission, had never been designed for replacement in orbit. Van Hoften had to peel back a protective panel, cut and tape back insulation, remove roughly two dozen screws, and cut several wires before Nelson installed the new unit using oversized gold-plated clips in place of the original tiny screws. It had never been done before, on hardware never meant for it, and it worked. SolarMax went on to observe the Sun for another five years.

Why this scrappy 1980s repair job still matters

While it might seem like space nostalgia, the npj Space Exploration paper argues that this is where on-orbit servicing as a discipline started: the methods, the equipments, and the confidence gained during the repair of SolarMax served as a basis for five Hubble Space Telescope servicing missions that were performed between 1993 and 2009, and are even mentioned by modern satellite-servicing commercial companies as the foundation of their work. NASA itself made a similar conclusion in its project report in 2010. And while it's quite interesting given all the promotion of "on-orbit repair" as some innovative technique in the space exploration industry, NASA basically mastered the trick in 1984 using duct tape, a failed attempt, and two men unscrewing bolts while wearing spacesuits. The tech might have changed, but the core idea remains intact.