In late 2013 and early 2014, NASA's Curiosity rover detected an unexpected spike in methane on Mars — 10 times the usual level. Within a few months, the spike faded. Since then, Curiosity has ...

But the new paper points to microbes as the biggest source of the methane spike. Michel and her co-authors analyzed samples ...

sharp spikes of snow. NASA scientists think the same process happens on Pluto. But this could only be possible if Pluto had been warmer in the past. Otherwise, the methane ice couldn't sublimate away.