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The hunt for alien life may have ended in the 1970s according to one former NASA scientists.
In an op-ed published in Scientific American titled 'I’m Convinced We Found Evidence of Life on Mars in the 1970s' former NASA scientist Gilbert Levin writes that a mission to Mars was the first concrete example of biological life on other planets.
Evidence - Possibility - Life - Mars - Fact
'What is the evidence against the possibility of life on Mars? The astonishing fact is that there is none,' writes Levin.
'Furthermore, laboratory studies have shown that some terrestrial microorganisms could survive and grow on Mars.'
Levin - Points - Pair - Missions - NASA
Levin points to a pair of missions in 1976 when NASA sent its Viking Landers 1 and 2 to Mars - the agency's first-ever trip to the Red Planet.
While there, the landers took several samples from the Martian soil in an attempt to rove contents for signs of biological life.
Tests - Labeled - Release - Life - Detection
One of the tests called the Labeled Release life detection experiment, which was spearheaded by Levin, involved combining martian soil samples with organic compounds and then looking for signs of carbon dioxide.
Any microorganisms that were present in the soil would have metabolized the compound and released CO2, says Levin.
Tests - Results - Landers - Miles - Planet
Shockingly, the tests initially turned up a significant four positive results and we duplicated by both landers located 4,000 miles apart on the planet.
Despite the initial success, however, further experimentation from NASA turned up empty-handed when NASA searched for specific microorganisms.
According to the agency,...
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