Water. Drenching over 70% of the planet’s surface. despite its abundance, scientists are still puzzled about how it got there. The water could have come in the form of dirty snowballs. Comets. But it would have taken tens of millions of comets to fill the Earth. so… what happened? well, during a period called the Late Heavy Bombardment (LHB), comets and asteroids rained down on the inner planets. if comets made our oceans, they should have a very particular molecular signature. Because not all water is the same.
On Earth, for every 10,000 drops of ordinary water, there are three drops of heavy Water. comets are almost half heavy water. but if comets made our oceans, the oceans have about half heavy water too, right? not so. comets = 50% heavy water
Earth oceans = 0.03% heavy water. so, comets are probably not the culprit. well, then, what is?
More On that for Pt 2!
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