According to data gathered by Curiosity, it is roving across what was once a lakebed. Further, the data suggests the water in that lake may have been drinkable by humans, if humans had been around. In fact, the lake would have existed well before multicellular life developed on Earth.
The case for a habitable early Mars is fairly strong, and seems to strengthen as we go. But was it inhabited? Did life ever begin on Mars? If Curiosity finds fossils in the sediment layers of Mount Sharp, a new epoch in human history will open up.
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