Water on Mars exists almost exclusively as water ice. The Martian polar ice caps consist primarily of water ice, and further ice is contained in Martian surface rocks at more temperate latitudes (permafrost). A small amount of water vapor is present in the atmosphere. There are no bodies of liquid water on the Martian surface.
A study conducted by researchers from the Carnegie Institution for Science concluded that both Earth and Mars got their water from the same source chondritic meteorites. However, unlike Earth, Martian rocks containing atmospheric volatiles such as water don’t get recycled into the planet’s deep interior. The origin, history, and evolution of Martian water are [...]
Several studies performed in the last decade have shown Mars used to be warmer and wetter, but scientists still haven’t figured out exactly why we are seeing these clues and how our red neighbor used to look like ages ago. Now, a new study concluded that Mars was much, much wetter than previously believed and [...]
NASA’s famous rover, Opportunity, seems to have stumbled upon clear evidence that water used to flow on Mars, a long long time ago. Opportunity was prowling around the Meridiani Planum on Mars, looking at hematite (an iron oxide) when it stumbled upon something which delighted researchers: gypsum. Why is this vein of gypsum so important [...]