Hematite is a mineralogical marker of ancient climate change on Mars. - Szczerba M; Peretyazhko TS; Rampe EB; Bristow TF; Tutolo BM; Ming DW; Vaniman DT; Morris RV; Ralston SJ; Haney NC; Kim BS; Blake DF; et al. (Science (New York, N.Y.), 2026)