Millions of fragments, abandoned spacecraft and spent rockets are accumulating around Earth. New European Space Agency findings show why preventing collisions may no longer be enough.
THE UNIVERSAL RECORD
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Brad Socha | October 13, 2026 | 10:15 PM EST
Earth’s orbit is becoming increasingly crowded, and much of what surrounds the planet is no longer functioning. Space junk includes abandoned satellites, spent rocket stages and fragments from collisions and explosions. These objects threaten spacecraft that provide communications, navigation, weather forecasting and scientific observations.
The European Space Agency’s (ESA) September 2026 Space Environment Report warns that the problem continues to worsen despite improvements in satellite disposal and debris prevention. Its projections indicate that collisions could increasingly generate new debris, creating risks that persist even if future launches are reduced.
The scale is considerably greater than the number of objects visible to tracking networks.
According to ESA statistics updated October 9, 2026, approximately 47,030 objects are regularly tracked in Earth orbit. Statistical models estimate roughly 68,450 objects larger than 10 centimetres, including active spacecraft, alongside 1.5 million debris fragments measuring between one and ten centimetres and another 230 million between one millimetre and one centimetre.
Many of these smaller fragments cannot be continuously tracked, yet they can still damage spacecraft travelling through the same orbital regions.
Why Space Junk Is Becoming More Dangerous
Objects in low-Earth orbit typically travel at speeds approaching 28,000 kilometres per hour. At these velocities, even a small fragment can strike with enormous energy. Larger debris can destroy satellites outright, while collisions involving substantial spacecraft or rocket bodies can produce thousands of additional fragments.
The danger is concentrated rather than evenly distributed around Earth.
Low-Earth orbit, generally extending to about 2,000 kilometres in altitude, contains many operational satellites and considerable historical debris. Commercial constellations have added thousands of spacecraft to already busy orbital bands, particularly those used for communications and Earth observation.
Higher-altitude regions present another challenge. Objects left hundreds of kilometres above Earth may remain there for decades or centuries because atmospheric drag is too weak to remove them quickly.
ESA reported that more than 300 launches placed over 4,000 payloads into orbit during 2025. The growing number of operational satellites means more potential encounters between spacecraft, while old rocket bodies and defunct satellites remain capable of breaking apart.
A collision does not simply remove two objects. It can transform them into a cloud of fragments spreading along different orbital paths, threatening spacecraft far from the original impact.
This possibility underlies the Kessler syndrome, named after NASA scientist Donald Kessler. It describes a process in which collisions create debris that causes further collisions, potentially sustaining the growth of the debris population.
It does not mean all spaceflight is about to become impossible. The risk depends on orbital altitude, object density and how effectively debris is removed. However, some regions could become progressively more dangerous and expensive to operate in.
ESA’s 2026 modelling indicates that current activity could produce substantially greater long-term congestion than earlier projections suggested. The agency now presents a 100-year projection horizon rather than the previous 200-year horizon, with sharply worsening results.
Satellite operators already rely on ground-based radar, optical observations and orbital calculations to identify potential close approaches. When a collision warning indicates sufficient risk, manoeuvrable satellites can adjust their trajectories.
These procedures reduce danger, but they cannot eliminate it. Many fragments are too small to track reliably, and abandoned spacecraft cannot move out of the way.
How Satellites Are Retired, and Why Cleanup Is Difficult
Preventing new debris begins before a satellite launches. Operators can design spacecraft to leave orbit promptly, avoid releasing unnecessary components and reduce the possibility of explosions after their missions end.
In low-Earth orbit, satellites may use propulsion to lower their altitude, allowing atmospheric drag to complete their descent. Some undergo controlled re-entry over remote ocean areas, while others re-enter without precise control. Engineers increasingly use design-for-demise techniques to help spacecraft components break apart and burn up more completely.
At higher altitudes, especially geostationary orbit, retiring satellites are often moved into graveyard orbits above operational spacecraft. Operators can also passivate satellites and rocket stages by venting remaining propellant, discharging batteries and releasing stored pressure.
Regulations are becoming stricter. The United States Federal Communications Commission requires covered low-Earth-orbit satellites using uncontrolled re-entry to complete disposal within five years of mission completion, replacing the older 25-year benchmark.
ESA’s Zero Debris initiative aims to sharply reduce debris generation by 2030. Its voluntary Zero Debris Charter had attracted more than 210 organizations, including 21 national governments, by January 2026.
There is measurable progress. ESA’s latest report found that controlled rocket-body re-entries outnumbered uncontrolled ones in 2025 for the second consecutive year.
However, safer disposal of new spacecraft cannot remove the abandoned objects already circling Earth.
Several cleanup technologies are being tested. The European RemoveDEBRIS mission demonstrated net capture and a harpoon striking a purpose-built target in orbit. Drag sails offer another approach, increasing atmospheric resistance to accelerate descent.
Japan-backed Astroscale’s ADRAS-J spacecraft approached a discarded rocket stage to approximately 15 metres in 2024, demonstrating close-range inspection without capturing the object. ESA’s ClearSpace-1 mission is being developed to capture and remove a defunct satellite using robotic technology.
These achievements establish important technical capabilities, but routine large-scale removal of uncooperative debris has not yet been demonstrated.
Cleanup also raises legal and financial questions. Under the 1967 Outer Space Treaty, ownership of a space object does not disappear when it stops functioning. The registering state retains jurisdiction and control, meaning another country cannot simply collect abandoned satellites without appropriate authorization.
International liability rules add complexity if a cleanup spacecraft damages another object. Meanwhile, removing large debris requires specialized spacecraft, precise navigation and substantial funding.
Who should pay remains unresolved. Governments and operators responsible for historical debris, companies deploying new constellations and users benefiting from orbital services all have interests in maintaining a safer environment. No comprehensive international system currently assigns the full cost of cleaning up Earth’s orbit.
ESA’s assessment is that stronger prevention alone will not be sufficient. Its modelling indicates that collisions could continue increasing the debris population even without additional launches, making active removal an important part of long-term stabilization.
The problem is serious, but its outcome is not predetermined. Shorter disposal timelines, better tracking, coordinated manoeuvres and practical removal missions could reduce future risks. Whether those measures succeed will depend on how quickly they expand relative to the number of satellites being launched.
Earth’s orbit remains usable. Keeping it that way will require treating the space surrounding the planet as a shared resource that needs continuing maintenance, rather than somewhere discarded spacecraft can remain indefinitely.
Sources:
European Space Agency — ESA Space Environment Report 2026
https://www.esa.int/Space_Safety/Space_Debris/ESA_Space_Environment_Report_2026
European Space Agency — Space Environment Statistics
https://sdup.esoc.esa.int/discosweb/statistics/
European Space Agency — Zero Debris Charter
https://blogs.esa.int/spacesafety-community/zero-debris/zero-debris-charter/
European Space Agency — Active Debris Removal
https://www.esa.int/Space_Safety/Space_Debris/Active_debris_removal
Federal Communications Commission — Five-Year Satellite Disposal Rule
https://docs.fcc.gov/public/attachments/DOC-387720A1.pdf
University of Surrey — RemoveDEBRIS Mission
https://www.surrey.ac.uk/surrey-space-centre/missions/removedebris
Astroscale — ADRAS-J Approaches Space Debris to 15 Metres
https://www.astroscale.com/en/news/astroscales-adras-j-achieves-historic-15-meter-approach-to-space-debris
United Nations Office for Outer Space Affairs — Outer Space Treaty
https://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/outerspacetreaty.html
United Nations Office for Outer Space Affairs — Liability Convention
https://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/liability-convention.html
About the Author
Brad Socha is the founder of The Universal Record, focused on sourced, factual global reporting. Coverage includes international news, geopolitics, technology, and major developments.