Is There Water on Mars?

Mars contains water mainly as ice today, including polar deposits and subsurface ice. Geological evidence also shows that liquid water was more widespread in the ancient past. Water is a central Mars question because its presence in the past is closely connected to geology and the possibility of ancient habitable environments.

Mars is a world where apparently simple questions often lead to larger scientific problems. Researchers combine spacecraft images, measurements from orbit, surface observations and laboratory analysis of Martian material to build explanations that can be tested. As with all planetary science, the strongest conclusions come from multiple observations that agree with one another.

The value of studying is there water on mars? is not limited to one isolated fact. Mars is a rocky planet with a long geological history, a thin atmosphere and evidence that its environment changed substantially over time. Individual observations become more useful when they are placed into that larger planetary context.