There Is Definitely Methane on Mars, Scientists Say. But Is It a Sign of Life? | 4/1/2019 | Mike Wall
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We may be one step closer to cracking the Mars methane mystery.

NASA's Curiosity rover mission recently determined that background levels of methane in Mars' atmosphere cycle seasonally, peaking in the northern summer. The six-wheeled robot has also detected two surges to date of the gas inside the Red Planet's 96-mile-wide (154 kilometers) Gale Crater — once in June 2013, and then again in late 2013 through early 2014.

Finds - Astrobiologists - Methane - Biosignature - Gas

These finds have intrigued astrobiologists, because methane is a possible biosignature. Though the gas can be produced by a variety of geological processes, the vast majority of methane in Earth's air is pumped out by microbes and other living creatures.

Some answers may soon be on the horizon, because that June 2013 detection has just been firmed up. Europe's Mars Express orbiter noted the spike as well from that spacecraft's perch high above the Red Planet, a new study reports.

Observations - Curiosity - Confirmation - Methane - Spike

"While previous observations, including that of Curiosity, have been debated, this first independent confirmation of a methane spike increases confidence in the detections," said study lead author Marco Giuranna, of the Istituto Nazionale di Astrofisica in Rome.

And that's not all. Giuranna and his team also traced the likely source of the June 2013 plume to a geologically complex region about 310 miles (500 kilometers) east of Gale Crater.

Giuranna - PFS - Investigator - Synergy - Curiosity

Giuranna, the PFS principal investigator, had prepared for synergy with the Curiosity team. Soon after the rover's August 2012 touchdown inside Gale, he decided to monitor the air above the crater over the long term, Giuranna said.

It's tricky to measure Red Planet methane from Mars orbit, for a variety of reasons, including the gas's low abundance and weak absorption. (It's no picnic measuring Mars methane from Earth, either, because the much more plentiful methane in our planet's atmosphere can complicate observations and interpretations. These factors help explain the...
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