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Heh.... I’m not ENTIRELY convinced of their explanation for where our water came from. (of course, I know nothing. I’m a mere idiot on the intrawebs, and I never found a Holiday Inn Express to stay at)
There is A LOT of water on our planet, perhaps even more than we can see. It’s just remarkable to me how when you look at other planets, they are all bone dry for the most part, and here we are with all of this water. Our Moon is even bone dry, and it’s only 250,000 miles next door. If find it difficult to believe that all of it came from ice via comets, or by condensation. If our water came from bombardment by Comets, how come the Moon didn’t also get bombarded? Even if it woudn’t have been covered with liquid water as we are, there should be a BUNCH of ice all over it.
According to evidence found in some of the oldest Zircon crystals, water was indeed here not very long after the planet cooled. Where it came from may be one of those questions that will never be answered. Our best chance may be if we can somehow see it happening on another planet somewhere.