October 22, 2018
Salty water just below the surface of Mars could hold enough oxygen to support the kind of microbial life that emerged and flourished on Earth billions of years ago, researchers reported Monday.
In some locations, the amount of oxygen available could even keep alive a primitive, multicellular animal such as a sponge, they reported in the journal Nature Geosciences.
Mars likely to have enough oxygen to support life: study
"We discovered that brines" -- water with high concentrations of salt -- "on Mars can contain enough oxygen for microbes to breathe," said lead author Vlada Stamenkovic, a theoretical physicist at the Jet Propulsion Laboratory in California.
"This fully revolutionises our understanding of the potential for life on Mars, today and in the past," he told AFP.
Up to now, it had been assumed that the trace amounts of oxygen on Mars were insufficient to sustain even microbial life.
"We never thought that oxygen could play a role for life on Mars due to its rarity in the atmosphere, about 0.14 percent," Stamenkovic said.
By comparison, the life-giving gas makes up 21 percent of the air we breathe.
On Earth, aerobic -- that is, oxygen breathing -- life forms evolved together with photosynthesis, which converts CO2 into O2. The gas played a critical role in the emergence of complex life, notable after the so-called Great Oxygenation Event some 2.35 billion years ago.
But our planet also harbours microbes -- at the bottom of the ocean, in boiling hotsprings -- that subsist in environments deprived of oxygen.
"That's why -- whenever we thought of life on Mars -- we studied the potential for anaerobic life," Stamenkovic.
- Life on Mars? -
The new study began with the discovery by NASA's Curiosity Mars rover of manganese oxides, which are chemical compounds that can only be produced with a lot of oxygen.
Curiosity, along with Mars orbiters, also established the presence of brine deposits, with notable variations in the elements they contained.
A high salt content allows for water to remain liquid -- a necessary condition for oxygen to be dissolved -- at much lower temperatures, making brines a happy place for microbes.
Depending on the region, season and time of day, temperatures on the Red Planet can vary between minus 195 and 20 degrees Celsius (minus 319 to 68 degrees Fahrenheit).
The researchers devised a first model to describe how oxygen dissolves in salty water at temperatures below freezing.
A second model estimated climate changes on Mars over the last 20 million years, and over the next 10 million years.
Taken together, the calculations showed which regions on the Red Planet are most likely to produce brine-based oxygen, data that could help determine the placement of future probes.
"Oxygen concentrations [on Mars] are orders of magnitude" -- several hundred times -- "greater than needed by aerobic, or oxygen-breathing -- microbes," the study concluded.
"Our results do not imply that there is life on Mars," Stamenkovic cautioned. "But they show that the Martian habitability is affected by the potential of dissolved oxygen."
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Mary Trump 'energized' as uncle 'Donald's campaign spirals into chaos'
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Donald Trump's campaign is in chaos, and his niece says she's energized.Mary Trump, the niece of the former president and a psychologist by trade, has previously been critical of her uncle.On Thursday, she said her uncle's failures are adding up.ALSO READ: A neuroscientist reveals how Trump and Biden's cognitive impairments are different"As the RNC’s fundraising falters and Donald’s campaign spirals into chaos, I am energized!" she said in a Substack post.She then continued:"When Donald dominates the news cycle, it’s hard not to feel overwhelmed. Every bad headline has a negative impact. But then I remember something crucial: There’s usually more to the story than meets the eye. I’m determined to cut through the media noise and share with you all the good that happened this week. These are the headlines we need to remain energized and hopeful that the media largely ignored."Mary Trump goes on to highlight President Joe Biden's recent fundraising hauls."President Biden’s $155 million+ war chest has just received another turbo boost, bringing the total of cash on hand to at least $180 million. (By comparison, between his campaign and the RNC, Donald barely has over $50 million — and continues to drain the accounts to cover his absolutely staggering legal expenses)," she wrote. "This is a development that could significantly increase Biden’s ability to influence the narrative in crucial swing states."This, she says, also tells us a lot about voter excitement for Biden."While critics have expressed doubts about the degree to which the Democratic base is fired up as compared to 2020, today’s $25 million fundraiser, raised with donations ranging from $250 to $500,000, should put any doubts to rest — yes, we are absolutely behind President Biden and Vice President Harris and we’re in this fight until the end," she wrote.Read the full post here.
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