NASA's Mars Reconnaissance Orbiter has found perplexing dark streaks that form seasonally and strongly suggest that liquid water flows on the Martian surface.
New research on seasonal streaks in Martian canyons provides evidence against underground pools of water.
Spacecraft images are keeping an eye on little surface flows on Mars that show up in midsummer, then fade over time. It's the strongest suggestion yet that the Red Planet can get wet.
Scientists have confirmed that water-soaked salts likely create dark seasonal lines on Mars.