Stellar dust and extraterrestrial particulate matter influence planetary climates, ecosystems, and habitability. Residual dust deposition from asteroid impact and exocodiacal sources may induce aerosol loading and “impact winters,” which suppresses net primary productivity (NPP). This project specifically investigates how these processes affect ecosystems by connecting EHAR-based models of impact energy and dust deposition to observable changes in the biosphere. The project also works to identify, preserve, and study sites where extraterrestrial dust has settled on Earth, which act as important records for understanding past impacts their implications for long-term planetary habitability.