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If the question is when did the first planets in the universe have liquid water, the answer is billions of years before the Solar System formed. The Earth is about 4,600,000,000 years old, and I think that the geological record shows that liquad water was already present about 4,000,000,000 years ago. So Earth gained liquid water less than 1,000,000,000 ...


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The question of water delivery to Earth, and planets in general, is one that is hotly debated! Let's start by using Earth as our benchmark. The total amount of water on the Earth's surface is around ~1.5 x 1021 kg, and we refer to this amount as one 'ocean' of water. There's also a huge amount of water inside the Earth itself, locked in e.g. hydrated ...


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