一项新的研究发现,2025年的一枚SpaceX火箭在欧洲上空重返时释放了锂进入高层大气,引起了对高空无管制污染的关切。 A 2025 SpaceX rocket re-entry over Europe released lithium into the upper atmosphere, a new study finds, raising concerns about unregulated pollution at high altitudes.

2026年2月19日发表的一项德国研究报告称，首次直接测量火箭再入污染，探测到2025年2月欧洲上空SpaceX猎鹰9号上面级燃烧后，高层大气中的锂含量增加了10倍。 A German study published on February 19, 2026, reports the first direct measurement of pollution from a rocket re-entry, detecting a 10-fold increase in lithium in the upper atmosphere after a SpaceX Falcon 9 upper stage burned up over Europe in February 2025. 研究人员利用地面激光雷达,将羽流追踪到爱尔兰以西的一个地点,确认火箭碎片将外来金属释放到“地光层”——一个50至100公里高度之间难以研究的区域。 Using ground-based lidar, researchers traced the plume to a site west of Ireland, confirming that rocket debris releases exotic metals into the "ignorosphere"—a hard-to-study region between 50 and 100 kilometers altitude. 研究结果突出表明,随着数千颗新卫星被规划成计划,环境关切日益加剧,并警告说,即使高空的小型排放物也会对气候和臭氧系统产生重大影响,但目前还没有关于高层大气污染的条例。 The findings highlight growing environmental concerns as thousands of new satellites are planned, warning that even small emissions at high altitudes could significantly impact climate and ozone systems, yet no regulations currently exist for upper atmospheric pollution.