Yuk L. Yung, professor of planetary science and Jet Propulsion Laboratory (JPL) senior research scientist, passed away on March 16, 2026 after a brief illness. He was 79. "Yuk loved Caltech, JPL, and his many close colleagues, and it showed in the many ways he shared his scientific passion and understanding of this life we lead together," says John Eiler, the Robert P. Sharp Professor of Geology and Geochemistry and Ted and Ginger Jenkins Leadership Chair of the Division of Geological and