Three billion years ago, the dusty planet we know today was a very different world.
in the Proceedings of the National Academy of Sciences, published Monday , contradict previous research suggesting Mars could not support such an ocean three billion years ago.that date to that time on Mars, for example, suggesting a lack of intense and widespread rainfall expected from a warm and wet climate. argues against a Martian climate that was too cold and dry for an ocean.
More water was potentially in ample supply, too. The northern ocean could have experienced moderate rainfall within it, as well as near its shorelines. Another potential source was flowing glaciers from the southern highlands of the Red Planet, which hosted ice sheets. An ocean-friendly Martian atmosphere looks somewhat like the carbon dioxide-filled version we see today, but with a twist: roughly 10% of the atmosphere was made up of 10% hydrogen gas, potentially getting released by volcanoes, cosmic impacts or chemical interactions between water and rock.
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