Sentences with phrase «shallow pools existed»
If these shallow pools existed at least 700 million years earlier — or when the oceans of Mars began to evaporate — they may have bridged a crucial gap for microbial life on the planet.
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What's more, the maps hint that shallow pools existed between about 3.5 billion and 3 billion years ago; in an older yet similar blink of a geologic eye, life on Earth may have appeared.