The Junkyard 400 Kilometres Above You
The oldest piece of debris still in orbit is Vanguard 1, an American satellite launched in 1958. It stopped functioning in 1964. It is still up there, circling Earth roughly once every two hours, and nobody has a plan to bring it down.
That detail gets stranger when you add scale. As of the last comprehensive count by the United States Space Surveillance Network, roughly 27,000 objects larger than 10 centimetres are being tracked in orbit. About 10,000 of those are active satellites. The remaining 17,000-plus are dead satellites, spent rocket stages, mission fragments, and pieces of things that have already collided with other things. Below the 10-centimetre threshold, where tracking becomes unreliable, estimates run to hundreds of thousands of fragments, possibly over a million objects larger than 1 centimetre, each one travelling at roughly 28,000 kilometres per hour. At that speed, a paint fleck carries the kinetic energy of a small bullet.
Kessler Syndrome: When the Math Turns Against You
In 1978, NASA scientist Donald Kessler published a scenario that orbital engineers still treat as the field's central nightmare. If debris density in low Earth orbit crosses a critical threshold, collisions begin generating more debris than removal can handle. Each collision creates new fragments. Those fragments cause more collisions. The cascade becomes self-sustaining, and the affected orbital shell becomes permanently unusable, not for a decade but for centuries. This is Kessler Syndrome, and it is not a theoretical future state. Kessler himself, in later interviews, suggested the process may already have begun in certain orbital bands. The 2009 collision between the defunct Russian Cosmos 2251 and an operational Iridium communications satellite added roughly 2,000 new trackable fragments to the count in a single event. China's 2007 anti-satellite missile test, which deliberately destroyed the Fengyun-1C weather satellite, added over 3,000 more. Two events. Over 5,000 new pieces of debris. The math does not improve from here without intervention.
The Technology That Actually Works
The engineering solutions are not speculative. Several have been tested in space already. The European Space Agency's ClearSpace-1 mission, scheduled for launch later this decade, will use a four-armed robotic claw to capture a defunct Vega rocket adapter and drag it into a destructive reentry. The RemoveDEBRIS satellite, built by the Surrey Space Centre and tested in 2018, successfully deployed a net to capture a target object and fired a harpoon into a panel at close range. Both worked. Japan's JAXA has tested electrodynamic tethers, conductive cables that interact with Earth's magnetic field to slow a satellite's orbit until it deorbits naturally. Ground-based laser nudging, which uses high-powered lasers to slightly alter the trajectory of small debris without physical contact, has been demonstrated in concept and is moving toward operational testing. The removal technology exists. It has been tested in orbit. The gap is not engineering.
The Funding and Legal Vacuum
Space debris sits in one of the most intractable governance gaps in international law. The 1967 Outer Space Treaty, which still governs space activity, establishes that nations retain ownership of their space objects indefinitely. A defunct Russian satellite is still Russian property. A dead American rocket stage is still American property. No country can legally remove another country's debris without permission. Getting that permission requires diplomatic negotiation for every single object, and no framework exists to compel it. The commercial incentive problem is equally stubborn. A company that develops debris removal technology and clears orbit is providing a public good, cleaner orbital lanes benefit every satellite operator equally, including competitors who paid nothing toward the cleanup. The economics of this are hostile to private investment. The company that does the work cannot charge the beneficiaries who didn't commission it. Several startups, including Astroscale, a Japanese company with operations across multiple countries, are attempting to build a business model around end-of-life satellite servicing, essentially getting paid by satellite operators to deorbit their own defunct hardware. This works only for satellites whose operators still exist and are willing to pay. It does nothing for the 17,000-plus objects already up there with no responsible party willing to write a cheque.
India's Exposure
ISRO operates in this environment. Chandrayaan-3's lunar insertion in 2023 required precise orbital manoeuvres through low Earth orbit. The Gaganyaan crewed mission, India's first, will put astronauts into the same altitude bands where debris density is highest. Aditya-L1, now stationed at the Sun-Earth Lagrange point L1, passed through those bands on its way out. ISRO has taken debris mitigation seriously in its mission design, the agency's guidelines require deorbiting satellites within 25 years of end of mission, in line with international standards, but mitigation is not removal. Following the rules on new objects does not reduce the existing stockpile. India is also an active participant in the Inter-Agency Space Debris Coordination Committee, the body that sets voluntary guidelines for debris mitigation among the world's major space agencies. Voluntary. The word carries all the weight of the problem.
Who Pays, and Why Nobody Has Answered
The proposals for funding debris removal fall into three categories. The first is a treaty-based international fund, similar to how maritime salvage law works, where nations contribute based on their orbital footprint. The second is a liability-based system, where the country or company responsible for debris pays for its removal or faces financial penalties. The third is a market-based approach, where governments contract removal missions the way they contract waste management on the ground. All three have been proposed. None has been adopted. The sticking points are attribution, proving which country's object caused a problem, and enforcement, which requires political will that no major spacefaring nation has yet committed. The United States, Russia, China, and the European Union collectively account for the overwhelming majority of tracked debris. A solution that doesn't include all four is not a solution.
What makes the debris problem genuinely strange is that the technology and the problem are both well understood, and the gap between them is entirely political and economic. Every space agency knows what needs to happen. The engineering has been demonstrated. The only missing piece is an answer to a question that sounds simple and has resisted every attempt at resolution: who pays for cleaning up a commons that everyone uses and nobody owns.
