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Life May Have Existed On Mars Based On Recent Findings By Scientists. This Was Inferred From The Spatial And Time Variability In Oxygen Concentrations In Gale Lake, Mars. The Oxygen Variations, At A Point In Time, May Have Precipitated Conditions Capable Of Sustaining Life. I Guess It’s Only A Matter of Time Or Not.

An ancient lake on Mars could have supported a variety of microbial life

http://www.latimes.com/science/sciencenow/la-sci-sn-mars-gale-crater-20170602-htmlstory.html

Gale Crater on Mars had the right physical and chemical conditions for life for 700 million years — and for part of that history, held a lake that could have hosted a wide variety of microbial life.