The Mars Reconnaissance Orbiter (MRO) captured this image of dark narrow streaks on the walls of Garni crater. Called recurring slope lineae, these streaks are believed to be formed by the flow of briny or salty liquid water on present-day Mars.
On September 28, 2015, NASA announced the possible connection between these features and flowing water on the red planet. Using an imaging spectrometer on MRO, scientists found hydrated minerals, called perchlorates, in the streaks. These water-related minerals could lower the freezing point of a liquid brine, allowing it to exist within the shallow Martian subsurface. The streaks also seem to change over time, darkening and appearing to flow down slopes in warm seasons, and then fading away in cooler seasons.