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Water ice lake found on Mars...


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Isotope studies (K40 - Ar40) have also been done. You look at the amount of argon present, which is a decay product from potassium and the rate of decay depends on the temperature. Tests revealed that there wasn't enough argon for the water to have been above 278K (i.e. freezing point) for over around a million years in the last 4 billion or so.


So, even though there's water, it may well have not been liquid for long enough for life. :)

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