Is Mars’ Methane Spike a Sign of Life? Here’s How We’ll Know

Last Wednesday, the Curiosity rover detected in Mars’ atmosphere a high concentration of methane, a gas which is usually associated with microbial life on Earth. While it’s too early to determine whether the gas was produced by Martian microbes or geological processes, the discovery prompted NASA scientists to reschedule Curiosity’s weekend to perform follow-up experiments. …

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