alternative_right shares a report from ScienceDaily: Researchers have found a clever new way to map a part of Earth’s upper atmosphere that is notoriously difficult to observe. Using orbital data from roughly 1,200 Starlink satellites, they reconstructed changes in atmospheric density about 500 kilometers above Earth. […] The resulting density patterns also showed strong consistency with observations from the European Space Agency’s SWARM satellites, which measure changes in atmospheric density along their orbital paths.