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The mystery of Extraterrestrial Life – Mars comes to life?

Posted on: June 9, 2011

The red planet is far more than just a catalyst for scientific change or an interplanetary base camp. Mars, says Robert Zubrin, founder of The Mars Society, is essentially a Rosetta stone for determining the prevalence and diversity of life in the Universe.

Mars once boasted gravity, an atmosphere, and liquid water in great abundance. According to Zubrin, if life is indeed a natural, chemical development wherever liquid water, reasonable temperatures and various minerals occur, then why shouldn’t it have appeared on Mars?
“If we can go to Mars and find evidence of past life, then we will have proven that the development of life from chemistry is a general phenomenon in the Universe,” Zubrin said in an interview with Discovery Magazine.

Evidence of possible life on Mars sent back from by two Mars Viking Landers in 1976 and 1977 was inconclusive, at least according the then primitive knowledge of both extreme life that we now know exists on Earth as well as the abundant existence of water and methane on Mars past and present.

On Mars, as on Earth, methane is extremely unstable because it’s continually being broken up by ultraviolet rays from the Sun and chemical reactions with other gases. The average life of a methane molecule on Mars is 400 years, which means the gas must be continually replenished or it will disappear. Something is producing methane on Mars today — the big question is: What? There is potentially a vast biosphere a few meters below Mars’ surface, which the Viking mission may not have been able to access since it was only scratching the surface of the uppermost layer of soil.

In fact, NASA’s first press release about the Viking tests announced that the results were positive. The “labeled Release” (LR) experiments had given positive results. But after lengthy discussions in which Carl Sagan participated, NASA reversed its position, mainly because another experiment detected no organics in the soil.

Yet to this day, Gilbert Levin, the principal designer of the LR experiment, believes the tests pointed to life. When the same two experiments were run on soil from Antarctica, the same conflicting results were obtained (LR – positive; organics – negative). Soil and ice from Antarctica’s Dry Valley certainly contains extreme life forms. The test for organics was negative because it is far less sensitive than the LR experiment. The same problem could have caused the organics test on to give a false negative. Before oxygen could accumulate in Earth’s atmosphere, all the exposed iron had to rust. During that process, lasting hundreds of millions of years, Earth was also a red planet.

In the journal Nature, Corinna Wu asked: Could the oxygen that rusted the iron on have been produced biologically? Could life on have simply “run out of steam” after that stage of its development?

Awesome new satellite images suggest that Mars was warm enough to sustain lakes three billion years ago, a period that was previously thought to be too cold and arid to sustain water on the surface.

The research, by a team from Imperial College London and University College London (UCL), suggests that during the Hesperian Epoch, approximately 3 billion years ago, Mars had lakes made of melted ice, each around 20km wide, along parts of the equator.

Earlier research had suggested that Mars had a warm and wet early history but that between 4 billion and 3.8 billion years ago, before the Hesperian Epoch, the planet lost most of its atmosphere and became cold and dry.

In the new study, the researchers analysed detailed images from NASA’s Mars Reconnaissance Orbiter, which is currently circling the red planet, and concluded that there were later episodes where Mars experienced warm and wet periods.

3D virtual reality video of Ares Vallis, which is a giant gorge that runs 2000 km across the equator of Mars. The lakes and their interconnecting channels can be seen a third of the way through the video. The researchers say that there may have been increased volcanic activity, meteorite impacts or shifts in Mars’ orbit during this period to warm Mars’ atmosphere enough to melt the ice. This would have created gases that thickened the atmosphere for a temporary period, trapping more sunlight and making it warm enough for liquid water to be sustained.

The researchers used the images from the Mars Reconnaissance Orbiter to analyse several flat-floored depressions located above Ares Vallis, which is a giant gorge that runs 2,000 km across the equator of Mars. Scientists have previously been unable to explain how these depressions formed, but believed that the depressions may have been created by a process known as sublimation, where ice changes directly from its solid state into a gas without becoming liquid water. The loss of ice would have created cavities between the soil particles, which would have caused the ground to collapse into a depression.

In the new study, the researchers analyzed the depressions and discovered a series of small sinuous channels that connected them together. The researchers say these channels could only be formed by running water, and not by ice turning directly into gas.

The scientists were able to lend further weight to their conclusions by comparing the Mars images to images of thermokarst landscapes that are found on Earth today, in places such as Siberia and Alaska. Thermokarst landscapes are areas where permafrost is melting, creating lakes that are interconnected by the same type of drainage channels found on Mars.

The team believe the melting ice would have created lakes (images at top of page) and that a rise in water levels may have caused some of the lakes to burst their banks, which enabled water to carve a pathway through the frozen ground from the higher lakes and drain into the lower lying lakes, creating permanent channels between them.

Professor Jan-Peter Muller, Mullard Space Science Laboratory, Department of Space Climate Physics at University College London, was responsible for mapping the 3D shape of the surface of Mars. He adds: “We can now model the 3D shape of Mars’ surface down to sub-metre resolution, at least as good as any commercial satellite orbiting the Earth. This allows us to test our hypotheses in a much more rigorous manner than ever before.”

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