The origin of Earth's water has been an enduring mystery.
,"the doubly deuterated water D2O is 1/1000 with respect to HO, namely about 107 times larger than what would be estimated from the D/H elemental abundance ratio."
The two happen in different conditions, and those conditions leave their isotopic imprint on the water. Water from the first synthesis is 4.5 billion years old, and the question becomes,"How much of that ancient water reached Earth?" Delivery by comets is another hypothesis for Earth's water. In that hypothesis, frozen water from beyond the frost line reaches Earth when comets are disturbed and sent from the frozen Oort Cloud into the inner Solar System. The idea makes sense.It still leaves unanswered questions, though. It doesn't explain how all the water reached Earth. But the study shows that the amount of heavy water on Earth is at least the beginning of figuring this out.
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