"The fact that microbes play a role in producing the distinctive silica structures at El Tatio raises the possibility that the Martian silica structures formed in a comparable manner - in other words with the help of organisms that were alive at the time," Ruff added.
But just because a feature on Mars resembles a feature on Earth doesn't mean they had the same formation processes and, indeed, this isn't the first time a Mars rover has seen potential fossilized "biosignatures" of ancient biology.
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In 2015, for example, NASA's Mars rover Curiosity imaged rocks that appeared to possess fossilized features resembling aquatic algae mats. Though the jury is still out as to whether or not these mats are indeed evidence of ancient life on the Red Planet - they are most likely just curious geological structures after all - we do know that the planet used to be a lot wetter than it is now, so if life's ingredients are present, perhaps some form of ancient Martian biology left its fossilized imprint behind.