Space
Ancient Mars may have had a liquid ocean despite freezing temperatures
A model based on Earth’s oceans and atmosphere explains how Mars could have been cold and wet 3 billion years ago
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A model based on Earth’s oceans and atmosphere explains how Mars could have been cold and wet 3 billion years ago
Mars used to have flowing water, which filled Jezero crater with an enormous lake. Images of cliff faces taken by NASA’s Perseverance rover show the lake used to flood 3.7 billion years ago