No Water on Mars? Think Twice!

Evidence in 2015 at the vast Gale Crater site indicates that liquid water on Mars may have been there for a million years or more and that it didn’t leave all at once. When scientists used an MRO imaging lens to look for mineral traces on Mars, they discovered that water-rich minerals caused unexplained streaking patterns.

Over time, these black streaks seem to flow in and out of the picture. During warm seasons, they darken and appear to flow down steep slopes. But as the seasons change, they gradually dissipate. When the temperature rises beyond minus ten degrees Fahrenheit, they occur in several regions on Mars.