Mars' Dark Streaks Suggest Salt Water Is Flowing On Red Planet

Dark seasonal streaks on slopes near the Martian equator may be a sign of flowing salt water on Mars, liquid runoff that melts and evaporates during the planet's warmer months, scientists say. NASA's Mars Reconnaissance Orbiter spotted the dark streaks on Mars as they formed and grew in the planet's late spring and summer seasons, when the Martian equatorial region receives the most sunlight. The streaks then faded the next season as cooler temperatures prevailed. These seasonally occurring flow...