Mars Underwent a Great Oxygenation

[Winston]

Planetary Scientists Discover That Mars Underwent a Great Oxygenation Event Billions of Years Ago - 12 Apr 2021

https://scitechdaily.com/planetary-...great-oxygenation-event-billions-of-years-ago
“This is a rather remarkable study with findings that will significantly impact how we understand the early evolution of terrestrial planets and their surface environments. The transition from a reducing to oxidizing atmosphere on Earth ~2.5 billion years ago was only possible because of the existence of life, as oxygen is a waste product of metabolic processes like photosynthesis. Without microbes producing oxygen, it would not accumulate in our atmosphere, and we could not be here. While there are certainly differences in the local conditions Mars and Earth have been subjected to during their evolutionary histories, my mind can’t help but start thinking about what Jiancheng’s results may mean for a potential early Martian biosphere,” Dr. McKenzie remarked.

 

[Engineer457]

Scientists never stop surprising me. We seem to know everything about how our planets formed and so on, but they shock the community with new statements from time to time. Mars was habitable long ago... it's a pity that there is no oxygen and water here now.

 

[Funkworks]

Martian water is presently frozen.

 

[Five]

Mars has polar ice caps made of water ice and carbon dioxide ice.