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A scientific analysis of samples collected on the surface of Mars shows the Red Planet has evolved its own version of a carbon cycle. The cycle helps create life on Earth, but why not on Mars?What you need to know Evidence of carbon deposits in the crust of Mars has been found, suggesting the presence of a carbon cycle. Mars once had a far warmer climate with liquid water and a thick carbon dioxide atmosphere. A broken cycle may have contributed to Mars becoming uninhabitable. Scientists studying soil samples from NASA’s Curiosity rover have discovered that a carbon cycle similar to the one that sustains life on Earth once played out on the Red Planet. While it’s unclear whether Marsever supported life, its current harsh environment may be due to an “imbalanced” carbon cycle. “Mars seems to have been habitable for its first billion years and that waned very quickly,” Ben Tutolo, a space researcher at the University of Calgary, Canada, told DW. Mars once had a thick atmosphere full of carbon dioxide capable of

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