The High-Speed Junkyard Above
Low Earth Orbit (LEO) is home to thousands of operational satellites that power everything from GPS and weather forecasting to global communications. But it’s also cluttered with an estimated 36,500 objects larger than 10 cm, including defunct satellites,
spent rocket stages, and fragments from past collisions. Each piece is hurtling at speeds of up to 28,000 kilometres per hour. At that velocity, even a small, untrackable fragment can cause catastrophic damage to a functional satellite. Experts have long warned of a theoretical chain reaction called the Kessler Syndrome, where collisions create more debris, leading to more collisions, until certain orbits become completely unusable. While not yet a cinematic cascade as seen in films, scientists agree that some orbital altitudes are already at a critical density, making active cleanup a necessity, not a luxury.
Why Cleanup Is a Multibillion-Dollar Opportunity
The growing risk to operational satellites, which represent billions of dollars in infrastructure, has created a powerful economic incentive for a cleanup crew. A recent market analysis projects the space debris removal market will grow from USD 143.0 million in 2025 to a staggering USD 9.57 billion by 2035. This explosive growth is driven by the sheer number of new satellites being launched—over 2,800 annually—especially for large constellations like Starlink and OneWeb. For commercial satellite operators, aerospace contractors, and defence agencies, protecting these valuable assets from collision is becoming a core strategic requirement, transforming orbital sustainability from a long-term goal into an immediate and addressable market.
Finding the Needle in the Haystack
Before you can remove a piece of debris, you have to find it and track it with incredible precision. This is the first major pillar of the debris removal market. The U.S. Space Surveillance Network tracks objects larger than a softball, but the real challenge lies in identifying smaller, lethal fragments. A new generation of technologies is rising to the occasion. Ground-based phased-array radar systems, like those operated by companies such as LeoLabs, can map LEO with high resolution, tracking thousands of objects per hour. Other innovations include using the star tracker cameras already on satellites to spot and report nearby debris, effectively turning the existing satellite population into a distributed monitoring network. AI-driven platforms are also being used to process data from multiple sources to predict potential collisions hours or days in advance.
The Tech of Capture and Removal
Once a target is identified, the next step is to capture it. This is where some of the most innovative engineering comes into play, with several competing methods being tested. Robotic arms, being developed by companies like ClearSpace for a European Space Agency mission, can grapple a target and secure it for removal. Other 'contact-based' methods include nets that wrap around tumbling objects and harpoons that anchor into larger pieces of junk; both were successfully demonstrated by the RemoveDEBRIS mission. Non-contact methods are also in development, such as using powerful lasers to ablate material from a debris object, creating a small amount of thrust to push it into a decaying orbit.
The Final Step: A Fiery End
After a piece of debris is captured, it must be safely removed from orbit. The most common method is controlled de-orbiting. The removal vehicle fires its thrusters to push the captured object into a lower trajectory where it will burn up upon re-entering Earth's atmosphere. For larger objects, this must be done with extreme care to ensure any surviving fragments land in a designated safe zone, typically a remote stretch of the Pacific Ocean. Another option is passive de-orbiting, which involves attaching devices like drag sails or electrodynamic tethers that accelerate the object's natural orbital decay over months or years. This is seen as a cost-effective solution for smaller satellites at their end-of-life.
The Emerging Market Players
The space debris removal field is a mix of government-funded missions and a rapidly growing commercial sector. Japan's Astroscale and Switzerland's ClearSpace are two of the most prominent pioneers, with both companies securing contracts with space agencies to demonstrate their technologies. Astroscale's recent missions have already proven its ability to rendezvous with and capture objects in orbit. They are joined by a host of startups and established aerospace giants like Northrop Grumman and Airbus, who are developing everything from tracking software to full-service removal vehicles. The market is shifting from experimental demonstrations to providing removal as a commercial service, with some companies aiming to remove multiple objects in a single mission.
