A rare find with big implications
, suggests that some of those lingering surface markers of ancient life may have been found—lying in plain sight, in fact.
Carbon comes in two principal isotopes: carbon-13, with six protons and seven neutrons; and carbon-12, with six protons and six neutrons. Carbon-13 doesn’t play well with biology; its heavier structure makes for tougher molecular bonds that don’t allow for the nimble coupling, decoupling and recombining that make biological processes possible, and that carbon-12 performs so easily.
NASA is no less sanguine about the findings—even if cautiously so. “We’re finding things on Mars that are tantalizingly interesting,” said Paul Mahaffy, a recently-retired member of the Curiosity science team, in a statement. “But we would really need more evidence to say we’ve identified life.” by Penn State. “However, we need more experimental results showing this … fractionation so we can rule in or rule out this explanation.”
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