News that the latest findings from the Mars Perseverance mission may have detected the best evidence yet of life on our neighbouring planet should provide a flurry of media attention in the next few days. it’s always good for disinterested science to get a little coverage. And we take our hats firmly off to the ingenious scientists, technicians and engineers who set up these missions and study their results with such assiduity. That said, dare we inject just a tiny note of caution into these heady proceedings? We think it’s what our readers have come to expect.
First to the results themselves, Which we admit are intriguing {1] Writing in The Conversation, Sean McMahon not only gives us a really clear exposition, he has ample links to the papers you’ll need if you wish to go further. Essentially, while exploring the Cheyava Falls region of Mars, Perseverance has found strong evidence of redox reactions, the very essence of life itself. What’s more the nature of the rocks and the visual clues, a scatter of pale spots associated with organic matter, strongly resemble similar patterns created by certain living processes here on earth. Slam dunk, get out the old David Bowie records? We would still urge caution.
Firstly because we,ve been here before. Twice actually. Older readers will recall the excitement generated by the Viking missions in 1976. [2] Two of the on board detectors, the Labelled Release and the Pyrolitic Release reported positive. However the crucial GCMS did not. And despite heroic efforts to reinterpret this data, such as the ones involving perchlorates, the Viking results must remain inconclusive in any rational. evidence based system of thought. Then there was the famous Allan Hills 84001 meteorite in 1996, which contained intriguing visual and chemical hints of microorganisms. Once again other explanations were possible. And the general consensus was the scientific equivalent of a hung jury. Quite right too, we think
And secondly because final proof will not be known until NASA and the ESA can whack up the ginger and the money for a Mars Sample Return mission. Which so far hasn’t really got beyond the talked-about stage. So Perseverance sits on Mars containing 30 tubes ready for collection, including the enigmatic Cheyvara Falls samples. Back on earth people speculate, bicker and wonder when the next war will begin. Until something happens to break this impasse, we say-don’t get out ahead of your data.
[2] https://en.wikipedia.org/wiki/Viking_program
[3]https://en.wikipedia.org/wiki/Allan_Hills_84001
#mars #astrobiology #microorganisms #evolution #life #NASA #ESA #perseverence
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