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Instead of relying on the sun's energy, life in the Martian lake could have survived on that liberated by chemical reactions. "This is really, for the first time, showing that absolutely all the ingredients are there for life based on chemistry, and that would be reactions between sulphur and iron. It says there were absolutely environments on Mars where energy from chemical reactions could have been harvested to make nutrient pathways work. It's so beautifully laid out," said Grady.