The American space agency's Mars rover Curiosity has recorded its largest measurement yet of methane.
The robot frequently "sniffs" the Red Planet for the gas but has never before seen so high a concentration - of 21 parts per billion (ppb).
The observations are fascinating because on Earth, methane is produced in large part by living things.
That's not necessarily the case on Mars; geological processes are very capable of making it as well.
Nonetheless, the latest data will heighten interest in the topic.
Through the course of its mission, Curiosity has noticed a number of spikes in methane ...
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