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BԪַNo smoking gunBԪַ: Calgary scientists studying Mars soil for signs it supported life

Researchers exploring rock record to understand if there was a time Mars was habitable
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This photo provided by NASA shows a rock collected by the Perseverance rover on Mars. NASA is launching two more mini helicopters to Mars in its effort to recover Martian rocks and soil samples and bring them to Earth. (NASA via AP)

A University of Calgary scientist is hoping to determine whether Mars was ever capable of supporting life.

Ben Tutolo, an associate professor in the Department of Geoscience and Faculty of Science, began his research earlier this year and is using data from the Curiosity rover thatBԪַs been exploring the Red Planet for the past decade.

The Canadian Space Agency, as part of the NASA-led Mars Science Laboratory mission, is funding the three-year study.

BԪַThe mission is to follow the water and understand BԪַ were ancient environments on other planets, like Mars, habitable?BԪַ said Tutolo, who is conducting the research alongside professor Steve Larter and associate professor Rachel Lauer.

BԪַWhat weBԪַre doing with the Curiosity rover is exploring the rock record there (to) understand if these rocks at that time were ultimately habitable.BԪַ

Tutolo said Curiosity has been providing a steady stream of data and has been collecting and analyzing samples as it slowly makes its way up Mount Sharp in the Gale Crater.

The rover, which had travelled almost 28 kilometres as of May 1, has multiple analyzers that can determine the chemistry and mineralogy of the rocks or soil surface on Mars. Its Canadian-made Alpha Particle X-ray Spectrometer has analyzed 1,211 samples and sent 2,659 results back to Earth.

BԪַItBԪַs scooping up, drilling samples BԪַ it can utilize in situ like a roving geologist who would also have a geochemical laboratory in the field,BԪַ Tutolo said.

The focus of the research is to study the geological transition from the oldest lake sediments where Curiosity began its exploration to younger layers of sediment farther up.

Tutolo said the geological evidence from the oldest rocks in the crater show they are from a river-fed lake that contained water.

The newer specimens have found magnesium sulphate salts, which were likely the result of the water evaporating as the planet became drier, he said.

BԪַObviously the transition has happened. There are no oceans or lakes on the planet today,BԪַ Tutolo said.

He said the team is also conducting field research at the Basque Lakes near Cache Creek, B.C., which contain the same sulphate minerals found on Mount Sharp on Mars.

However, Tutolo said the fact that the Mars crater is 3.5 billion years old means there might not be a definite answer to whether life did exist there.

BԪַThey have all been degraded in some ways. TheyBԪַve all been transformed by the geological processes working overtime in the crater so BԪַ there will be no smoking gun,BԪַ Tutolo said.

But he said if the rock record shows it was theoretically habitable, then it can still answer some questions.

BԪַIf it was habitable, then we could start putting together scenarios for how life could have originated in such an environment and if it did originate, how it could potentially thrive in such an environment,BԪַ he said.

BԪַI think what we can do as objective scientists is read the story that is written in the rocks and understand and lay the foundation and paint the picture of whether it was possible.BԪַ

BԪַBill Graveland, The Canadian Press





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