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As luck would have it, one of the major obstacles to the terraforming of Mars is the deeply toxic nature of its soil (or rather, regolith) caused by an abundance of perchlorates. From the paper, Perchlorate on Mars: a chemical hazard and a resource for humans Perchlorate (ClO4−) is widespread in Martian soils at concentrations between 0.5 and 1%. At such ...

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