Some 20, 000 pieces of rubbish are currently being monitored in low-Earth orbit, the majority of which are discarded bits of spacecraft or debris from collisions.

目前，科学家们正在对近地轨道上的两万块太空垃圾进行检测，其中的绝大多数来自于碰撞的残骸或太空飞船的废弃物。