Observations from NASA’s Mars Reconnaissance Orbiter have revealed what may be seasonal flows of salty water. Recurrent slope linea on the south-facing slope of a crater on the floor of Melas Chasma, Mars. Image credit: McEwen AS et al / NASA / JPL-Caltech / University of Arizona. Finger-like geological features, called recurrent slope linea, were first reported in 2011 on mid-latitude southern Martian slopes. They appear and extend down rocky...