Large quantities of methane gas have been detected on Mars, Nasa scientists have announced in Science journal.
The gas could be produced either by geological activity or by life.
Methane was detected in the Martian atmosphere five years ago; scientists have found it is more abundant over particular parts of the planet.
It should last for only a short time in the atmosphere until it is destroyed by sunlight, and so its continued presence means it is being replenished.
This suggests the methane is made by an ongoing process.
But the ultimate origin of the methane could either be an ancient or a modern one, say the researchers.
"The fact that we have found three discrete regions where Mars is releasing methane at this time means we have a window into processes occurring under the surface of the planet," said co-author Michael Mumma, a senior planetary scientist at Nasa's Goddard Spaceflight Center in Maryland, US. ---
The gas could be produced either by geological activity or by life.
Methane was detected in the Martian atmosphere five years ago; scientists have found it is more abundant over particular parts of the planet.
It should last for only a short time in the atmosphere until it is destroyed by sunlight, and so its continued presence means it is being replenished.
This suggests the methane is made by an ongoing process.
But the ultimate origin of the methane could either be an ancient or a modern one, say the researchers.
"The fact that we have found three discrete regions where Mars is releasing methane at this time means we have a window into processes occurring under the surface of the planet," said co-author Michael Mumma, a senior planetary scientist at Nasa's Goddard Spaceflight Center in Maryland, US. ---
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