Tantalizing new evidence has suggested that there may be a salty lake below a glacier on Mars. While brine at freezing temperatures does not sound like the most hospitable of environments, it is difficult to resist pondering whether organic life could survive – or even make some kind of living – there. But what sort of life form could it be? As Mars was once a far more watery place, it may indeed be harboring some ancient life form – either fossilized or alive. It is also possible that microbes from Earth have accidentally contaminated the planet during past space…

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