Unusual Martian mounds could help solve one of the red planet’s biggest mysteries

Images of Mars taken from orbit show thousands of mounds in a region sculpted by water billions of years ago. A robotic mission may investigate the area one day.

​ Images of Mars taken from orbit show thousands of mounds in a region sculpted by water billions of years ago. A robotic mission may investigate the area one day. Read More Breaking News, Latest News and Videos | CNN