For years, scientists have been looking for signs of liquid water just beneath the surface of Mars. The problem, though, is that the observations from various orbiting probes have been maddeningly ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The discovery by the Mars rovers of carbonate in sedimentary rock on the Red Planet has enabled ...

One of the great unsolved problems in modern planetary science is written on the surface of Mars. Mars has canyons that were carved by rivers, so it was once warm enough for liquid water. How—and ...