Mars had water for longer than previously thought
High concentrations of silica point to the existence of groundwater long after lakes evaporated. This finding extends the potential window for life on the planet. The discovery of light-toned bedrock – called ‘halos’ – with high concentrations of silica in Mars’ Gale crater, reveals that groundwater persisted once the lake in Gale crater dried up. The discovery was made by NASA’s Curiosity rover which traveled more than 16 km over 1,700 Martian days from the bottom of Gale crater to Mount Sharp in the crater’s center.
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