Overview
- An international team led by LeoLabs’ Darren McKnight presented the list at the International Astronautical Congress in Sydney.
- Removing the ten highest-risk objects would cut collision risk by about 30%, and eliminating all fifty would reduce it by roughly 50%.
- Of the top 50, 34 are Russian/Soviet—mostly SL-16 and SL-8 rocket bodies—with China contributing ten, the United States three, Europe two and Japan one.
- The list highlights legacy hardware at high altitudes, with Europe’s defunct Envisat ranked near the top of the most dangerous items.
- Since January 1, 2024, 26 rocket stages likely to remain more than 25 years were left in low Earth orbit, including 21 from Chinese constellation launches, while large-scale cleanup remains technically feasible but unfunded.