Chroococcidiopsis (see https://en.wikipedia.org/wiki/Chroococcidiopsis) are photosynthetic cyanobacteria that have been exposed for two and a half years to both open space conditions and conditions similar to those found on the Martian surface, surviving without too many problems in both situations.
This experiment was performed on the International Space Station (ISS stands for International Space Station).
The results of these experiments should make us think about the actual habitability of a planet like Mars, which is too often defined as an arid and inhospitable planet for life.
Not only of the known bacterial strains could survive the current conditions of Mars, but in the past the red planet possessed the same conditions that led to the birth of life on Earth; this does not suggest anything to you?
Full article in Astrobiology Magazine: https://www.liebertpub.com/doi/10.1089/ast.2018.1900
Full article in free downloadable PDF: https://www.liebertpub.com/doi/pdf/10.1089/ast.2018.1900
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