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Liquid Water Flowed On Mars, Boosting Hope For Finding Evidence Of Life

Scientists discover gullies carved by thawing ice, resembling those in Antarctica
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Liquid water flowed on Mars just a few hundred thousand years ago, scientists say .

Thawing ice carved gullies into the landscape where environments could have been habitable – increasing hope of finding evidence of life.

They resemble those in the Dry Valleys of Antarctica – caused by water erosion from melting glaciers.

Ancient lakes once dotted the Red Planet. Vast quantities of water are locked up in sheets of permafrost at the frigid poles,Mars will eventually tilt to 35 degrees again, the researchers said.


An Emirati walks past a screen displaying the “Hope” Mars probe at the Mohammed Bin Rashid Space Centre in Dubai on July 19, 2020, ahead of it’s expected launch from Japan.Temperatures typically hover about 70 degrees below freezing. Proving liquid water could exist has been difficult.Head and colleagues believe gully formation was driven by a combination of melting ice and CO2 frost evaporation in other parts of the year.PHOTO BY GIUSEPPE CACACE/GETTY IMAGES 

Scientists have long wondered whether life ever existed on Mars. NASA’s mantra in the search for extraterrestrials is to follow the water.

On Earth, all lifeforms require water to survive. Among the planets in our solar system, only Earth has a more hospitable climate than Mars. It is suspected Mars once sheltered primitive, bacteria-like organisms.

The U.S. team used a computer model to simulate a ‘sweet spot’ when conditions on Mars allow the planet to get above freezing – leading to periods of flowing liquid water.



The phenomenon could not be explained without the occasional presence of water.

The vast area in the southern hemisphere is known for deposits of minerals – with implications for the possible existence of Martian life.

The study in the journal Science fills missing gaps in the planet’s geological history.

Previous theories suggest gullies were carved by carbon dioxide frost, which evaporates from soil, causing rock and rubble to slide down slopes.

But their height indicated meltwater from glaciers had to be involved because of the distance they traveled down the slopes and levels of erosion.If ice was present, conditions would have been right for melting as temperatures rose above 273 degrees Kelvin, equivalent to about 32 degrees Fahrenheit.



“This means that Mars has been able to create liquid water in enough volume to erode channels within the last million years, which is very recent on the scale of Mars geologic history.”

The researchers had seen similar features firsthand in Antarctica. There, despite the cold temperatures, the sun is able to heat ice just enough for it to melt and for gully activity to occur.

The study also introduces the importance of these gullies in terms of potential targets to visit during future exploration missions.


Produced in association with SWNS Talker

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