Scientists have identified what is believed to be the first example of methane leaking from the sea floor.
The long-running mystery of methane on Mars has now been joined by another perplexing enigma - oxygen.
NASA's long-lived Curiosity rover picked up the sudden and unexpected spike of methane on Wednesday.
Despite methane being detected on Mars previously, more recent scans have revealed no sign of it at all.
Scientists have confirmed via ESA's Mars Express probe that Curiosity did detect methane on the Red Planet.
Despite the detection of methane in 2003 and 2014, the latest findings have revealed no evidence of it at all.
Esieh Lake in northern Alaska is releasing so much trapped methane that you can literally set the air ablaze.
The enigmatic dwarf planet is home to a 'riot of processes' that continue to surprise researchers.
ESA's Trace Gas Orbiter has started its mission to seek out traces of biologically-produced methane on Mars.
New laboratory experiments have added support to the idea that microbes could be living on Saturn's icy moon.
A lack of carbon monoxide on a methane-rich world could indicate the presence of extraterrestrial life.
NASA has revealed the discovery of methane and other chemicals in the gas giant's upper atmosphere.
A new US study has revealed that cow flatulence is responsible for a recent rise in atmospheric methane.
A mysterious spike of methane picked up by the Curiosity rover two years ago has yet to reoccur.
A new discovery off the coast of Norway could help to solve the long-running Bermuda Triangle mystery.
Scientists have identified traces of methane inside space rocks that are thought to have come from Mars.
The rover's instruments have picked up unequivocal evidence that there really is methane on Mars.
NASA's exploratory rover has discovered mysterious 'belches' of methane gas on the surface of Mars.
Scientists have discovered several hundred vents pumping methane out from the bottom of the Atlantic.
A herd of cows managed to cause a significant gas explosion on a dairy farm in Rasdorf, Germany.