ESA: LEO collision risk up ~20% in 2026 as tracked objects pass 28,000

Summary

ESA's 2026 Space Environment Report finds low-Earth-orbit collision risk up about 20% year-on-year, with roughly 28,500 objects larger than 10 cm now tracked by the US Space Surveillance Network, only ~18,000 of them active satellites. Active satellites must run ever more collision-avoidance manoeuvres as Starlink, Chinese and other megaconstellations fill the same shells. ESA says averting runaway cascade dynamics requires ≥95% disposal-compliance for large-constellation satellites plus active removal of legacy objects, neither yet achieved. The World Economic Forum's "Clear Orbit, Secure Future" report puts the cost of the current trajectory at $25.8–42.3B over 2025–2035. The problem is structural: more launches, more shells, more traffic to coordinate.

By the numbers

• ~20%, year-on-year rise in LEO collision risk (ESA 2026).
• ~28,500, tracked objects >10 cm; ~18,000 active satellites.
• ≥95%, disposal-compliance rate needed to avert cascade.
• $25.8–42.3B, WEF estimate of the decade cost of the current path.

Why it matters

A Kessler-type cascade in a key LEO shell could deny that orbit for a generation, threatening broadband, navigation and military satellites alike. The congestion is a direct cost of the megaconstellation race, and no operator fully bears it.

What to watch

• Whether disposal compliance climbs toward 95% as deadlines bite.
• First operational active-debris-removal missions (Astroscale, ClearSpace).
• Any actual collision or close-call between active constellation satellites.