Hey Kenyc, I have been facinated by the Oort cloud for some time too and I read anvil of change by jack dash. Its a sci-fi book and not a bad read but the oort cloud forms the back drop to the story and he offers an interesting idea. In the book, the cloud was formed when the proxima centaury binary system formed, it disrupted the kuiper belts of the two stars and threw all the comets out into space which also explains the early (or is it late?) bombardment and, as you said, earth's water. I thought it was a cool idea - it might even be true.
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