A Falcon 9 upper stage burned up over Europe last February, and German scientists just caught it doing something to the atmosphere nobody had directly measured before

Scientists in Germany have reported the first direct detection of upper-atmospheric pollution linked to the reentry of a specific piece of space debris, after a SpaceX Falcon 9 upper stage burned up over Europe in February 2025 and left behind a measurable plume of lithium.

A Falcon 9 upper stage burned up over Europe last February, and German scientists just caught it doing something to the atmosphere nobody had directly measured before. Scientists in Germany have reported the first direct detection of upper-atmospheric pollution linked to the reentry of a specific piece of space debris, after a SpaceX Falcon 9 upper stage burned up over Europe in February 2025 and left behind a measurable plume of lithium. The finding does not prove a catastrophe is unfolding above Earth. It does something more basic, and potentially more important: it shows that a single reentering rocket stage can be chemically traced after it breaks apart in the upper atmosphere. In a study published in Communications Earth & Environment, researchers reported a tenfold enhancement of lithium atoms at about 96 kilometres altitude over Kü...