A new study using deep craters in the southern highlands of Mars as windows into the subsurface suggests that the Red Planet had a large amount of water underground through the first billion years of its history. Minerals that are associated with water are present on the floors, walls, and rims of the craters.
The case for substantial amounts of water and water ice through Martian history is strong and seems to get stronger the more we probe. That's good news for those looking for life on Mars. We know that water ice exists underground over much of the northern hemisphere today. That's good news for a possible human future on Mars.
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