The old atmosphere of Mars might not have had much oxygen after all

Ancient Mars may not have had oxygen in its atmosphere after all, a new study has found – but don’t despair, life could still have crawled on the planet’s surface.

At NASA Curious Rover found manganese oxide in Martian rocks in 2016 cheered many planetary scientists, believing the mineral’s presence was a significant clue to past oxygen concentrations in the planet’s atmosphere. The odds of the past existence of life up Mars suddenly seemed higher as well, as oxygen is one of the key factors for life Earth.

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