A former NASA scientist says we have already discovered alien life
In an op-ed , Gilbert Levin says Viking missions to Mars uncovered signs in 1976
Four Mars soil samples turned up positive in initial tests for microorganisms
NASA says it was never able to actually definitively prove their existence
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.
'What is the evidence against the possibility of life on Mars? The astonishing fact is that there is none,' writes Levin.