The pattern remains a mystery, but researchers are beginning to narrow the possibilities.
While the changes are most likely…geological in nature, planetary scientists can’t completely rule out an explanation involving microbial life.
Just as the Viking landers claimed? Uh-oh.
Or is it just chemicals (perchlorate, bleach-like substances) in the soil, releasing oxygen and methane depending on the amount of sunlight/heat?
How would this affect humans who set up camps in the low-elevations areas, where they could be closer to water?