Curiosity rover may be 'burping' methane out of Mars' subsurface

Curiosity rover may be 'burping' methane out of Mars' subsurface

Since 2012, NASA's Curiosity rover has repeatedly detected methane on Mars, specifically near its landing site inside the 96-mile-wide (154 kilometers) Gale Crater. But that Mars methane is behaving erratically. It only appears at night, it fluctuates seasonally and it spikes unexpectedly to levels 40 times higher than usual. To make things more puzzling, the gas isn't present in appreciable amounts high in the Martian atmosphere, and it hasn't been detected near the surface in other Red Planet locales. So …