re: Would ET's risk navigating the Oort Cloud to visit Earth?

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True. But I have to think that if a civilization had figured out a means to achieve travel between star systems, they'd have the means to navigate through something like the Oort Cloud.

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True. So I was thinking the OC might serve as a type of filter to keep the trashier, low end ET's away. It seems like a fairly substantial obstacle that would take a while to get thru (if it's 3 light years out).