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Ever since Curiosity landed on Mars, it has been in search of methane. It couldn't find any for years, until a new set of experiments unveiled today that detected big spikes in methane on Mars. Scientists have no idea what caused the spikes, but the most intriguing explanation is "life on Mars."
Much of the methane on Earth comes from microbes belching the gas into the atmosphere. NASA scientists caution there are still non-biological explanations for methane on Mars, such as ultraviolet radiation causing chemical reactions on Mars's surface or trapped methane being released from lattices of ice.
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