3.7 million year old soil found deep in a martian crater has given researchers a tantalising clue that life could still exist on the red planet.
Recent images from Curiosity from the impact Gale Crater reveal Earth-like soil profiles with cracked surfaces similar to those in Antarctic Dry Valleys and Chile's Atacama Desert, a new paper reveals.
Chemical analysis shows a structure similar to soil containing microbes on Earth - with one expert proclaiming the new research shows 'there is a real possibility that there is or was life on Mars
Malcolm Walter of the Australian Centre for Astrobiology, who was not involved in the research, said the potential discovery of these fossilized soils in the Gale Crater dramatically increases the possibility that Mars has microbes.
'There is a real possibility that there is or was life on Mars,' he wrote.
'There is a real possibility that there is or was life on Mars,' he wrote.
Steven Benner of the Westheimer Institute of Science and Technology in Florida has speculated that life is more likely to have originated on a soil planet like Mars than a water planet like Earth.
In an email, Benner wrote that Retallack's paper 'shows not only soils that might be direct products of an early Martian life, but also the wet-dry cycles that many models require for the emergence of life.
University of Oregon geologist Gregory Retallack made the discovery based on images and data captured by the rover Curiosity.
The research adds to the growing body of evidence that microbial life once existed on the red planet.
His analyses appear in a paper placed online this week by the journal
Retallack, the paper's lone author, studied mineral and chemical data published by researchers closely tied with the Curiosity mission.
'The pictures were the first clue, but then all the data really nailed it,' Retallack said.
'The key to this discovery has been the superb chemical and mineral analytical capability of the Curiosity Rover, which is an order of magnitude improvement over earlier generations of rovers.
'The new data show clear chemical weathering trends, and clay accumulation at the expense of the mineral olivine, as expected in soils on Earth.
'Phosphorus depletion within the profiles is especially tantalizing, because it attributed to microbial activity on Earth.'
The ancient soils, he said, do not prove that Mars once contained life, but they do add to growing evidence that an early wetter and warmer Mars was more habitable than the planet has been in the past 3 billion years.
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