Carbonates identified by the Curiosity rover indicate a carbon cycle operated on ancient Mars. - Tutolo BM; Hausrath EM; Kite ES; Rampe EB; Bristow TF; Downs RT; Treiman A; Peretyazhko TS; Thorpe MT; Grotzinger JP; Roberts AL; Archer PD; et al. (Science (New York, N.Y.), 2025)