Lost tools and the space debris contribution

Every wrench, tether, and screwdriver that leaves an astronaut’s hand in orbit is more than a mistake. It is a piece of high-speed debris that threatens every crewed mission and satellite worth billions. When we talk about space debris, most people imagine dead satellites or spent rocket stages. But the real story for anyone working outside a spacecraft—anyone doing an EVA, or extravehicular activity—is about the tools. Gear that was designed to be reliable quickly becomes a hazard the second it gets loose. And the more we build in space, the more lost tools we leave behind.

Let’s be clear about the scale. Since the first spacewalk in 1965, NASA and other agencies have lost dozens of tools during EVAs. Pliers, clamps, tape guns, and even a camera bag have all drifted off into the void. The most famous incident happened in 2008 when astronaut Heidemarie Stefanyshyn-Piper lost a grease gun worth about $100,000 during a spacewalk to repair a solar array on the International Space Station. That tool is still out there, orbiting Earth at 17,500 miles per hour, alongside a washer, a sock, and a spatula that one crew member accidentally let go. None of this is trivial. At orbital velocity, a fleck of paint can punch a hole in a spacesuit. A greasy tool the size of your forearm will go through aluminum like a hot knife.

So why does this keep happening? The answer is simple: EVA gear is bulky, gloved hands lose grip easily, and the work is always awkward. When you’re wearing pressurized gloves that feel like oven mitts and floating in a vacuum, even a simple task like unplugging a connector takes forever. Tools get passed between hands that are already tired. Tethers snag. Something slips. And then it’s gone. Once a tool breaks free, it doesn’t fall to Earth—it stays in orbit, becoming a member of the growing population of lethal junk that space agencies track from the ground. The U.S. Space Surveillance Network currently monitors over 35,000 objects larger than a softball, along with hundreds of thousands of smaller pieces. Every lost tool gets added to that catalog.

The mitigation efforts are improving, but they aren’t perfect. Modern EVA tools are designed with multiple redundant tethers. Ratchets have lanyards built into the handle. Drills have foam inserts that prevent bits from flying off. Astronauts also use “tool caddies” that attach to their suits with carabiners, keeping the gear close to their chest where it’s harder to drop. But no one has solved the fundamental problem of the human hand in space. Gloves stiffen over time as the outer layers wear down against abrasive surfaces. On long spacewalks, hand fatigue is a serious issue. When your grip strength is gone, you lose mechanical advantage, and the tool goes.

There is also a darker reality here that doesn’t get talked about enough: as commercial space stations start launching in the next few years, the number of EVAs will skyrocket. Companies like Axiom Space and Bigelow Aerospace are planning to build modular habitats that require assembly and maintenance by humans in orbit. Each of those missions will involve dozens of tools floating around outside. The odds of losing hardware increase with every spacewalk. Even with careful training, statistics are unforgiving. When you put more people and more gear in orbit, you generate more debris. The lost tools of today are the collision hazards of tomorrow.

What can be done? Some engineers are already working on “self-retracting” tools that automatically reel back to the astronaut if let go. Others are experimenting with magnetic docking stations on the outside of spacecraft, so that gear stays put even if dropped. But these solutions add weight and complexity to every mission. In space, weight equals money, and simple mechanical reliability often beats clever gimmicks. The real answer might be even simpler: fewer tools, better tethers, and relentless training under realistic glove conditions.

For now, every piece of equipment that leaves the airlock is a potential piece of debris. When an astronaut loses a wrench, they don’t just lose a tool. They lose a weapon moving through the sky that someone else might have to dodge. The next generation of spacefarers will inherit that problem along with the hardware. The gear we use today is the legacy we leave behind—not just in the history books, but in the orbits we fly through.