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At the beginning of this period, the initial very dense atmosphere, which formed as a result of asteroid or comet impacts and outgassing of the planet's mantle, started to cool down. Eventually, the water vapour in the atmosphere would have condensed into a vast ocean, perhaps even a global ocean, that existed at high temperature - much like in a pressure cooker.
Slowly, this large body of water started to cool down, resulting in a first window for the possible emergence of life around 4.