A graphic detailing how spacecraft reentry introduces metals into the stratosphere. Credit: Chelsea Thompson, NOAA
BOULDER, Colorado — Researchers are calling for increased attention and better protection against the rising introduction of exotic materials into Earth’s atmosphere from satellite and space hardware re-entry, especially in an era of megaconstellations.
At the 2026 European Geosciences Union held May 3-8 in Vienna, Austria, panelists raised questions about the atmospheric impacts of spacecraft launches and re-entries, along with research and policy priorities to promote environmental sustainability for space. The subject is also expected to be explored again at a National Academies gathering in July.
“This is a topic of increasing importance and concern for researchers working to understand the potential impact of a formidable space industry in the absence of regulation needed to prevent harm,” said session organizer Eloise Marais, a professor of atmospheric chemistry and air quality within the Department of Geography at University College London in the United Kingdom.
The conference included several research projects focused on determining the atmospheric impacts of space launch and reentry. Among the presentations and research directions reviewed were:
