Everyone but China has pretty much stopped littering in low-Earth orbit

A recent assessment of the most hazardous space debris in low-Earth orbit reveals a troubling trend: the majority of these concerning objects are remnants from over 25 years ago. Among the most problematic are defunct rockets that continue to drift through space long after their missions have concluded. Darren McKnight, the lead author of the study presented at the International Astronautical Congress in Sydney, highlighted that a staggering 76 percent of the debris listed in the Top 50 originates from the last century. Furthermore, a significant 88 percent of these objects are rocket bodies, underscoring the critical issues posed by outdated space technology. The identified debris poses a significant risk of generating additional space junk through potential collisions. The objects are traveling at nearly 5 miles per second within a crowded section of low-Earth orbit, specifically between 700 and 1,000 kilometers (435 to 621 miles) above our planet. A collision, even with a relatively small piece of debris, could result in an explosion of fragments, potentially leading to a catastrophic chain reaction known as Kessler Syndrome. In his conversation with Ars Technica prior to the paper's release, McKnight elaborated on the analysis methods, which evaluated the proximity of these objects to other satellites, their altitude, and their mass. Notably, larger debris located at higher altitudes presents a greater long-term hazard as they could produce debris that lingers in orbit for centuries. The study indicates that Russia and the Soviet Union are the largest contributors to this debris problem, with 34 objects making the Top 50 list. China follows with 10, while the United States has three, Europe two, and Japan one. Russia's SL-16 and SL-8 rockets are particularly notorious, collectively occupying 30 slots in the Top 50. The implications of this research are profound, as the continued presence of such debris in low-Earth orbit threatens both current and future space operations.