NASA's Mars Phoenix Lander has found that most of the CO2 in the atmosphere has come from volcanic eruptions a few million years ago, but it is clear that this carbon dioxide has "almost certainly reacted with liquid water" suggesting that the water surface on Mars existed more recently than the 20 million years ago, which was the previous estimate. The "Phoenix Lander's data suggest that water-iduced weathering of Martian rocks has mainly occurred in ow temperature areas" also suggesting the water survived on Mars in the cold and dry areas.
Sticking with the goal of landing a US manned ship on Mars by 2025, the survival of water [the essence of human life] in cold and dry areas of Mars may give insight into possible human dwelling areas on Mars.
Source: [Gizmodo]
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