Mars’ slope lineae suggest presence of liquid water

RSLs are associated with material moving downslope: suggesting presence of water
A study of numerous seasonal dark streaks called “recurring slope lineae” or RSLs found at a canyon network on Mars has offered important clues that liquid water could be present on the Red Planet.
Water pulled from the atmosphere by salts, or mechanisms with no flowing water involved, remain possible explanations for the occurrence of RSLs in part of the Valles Marineris region near Mars’ equator