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Yeah, scale is something people really can't grasp. It's the same thing for people who argue against evolution, I think they just don't really grasp the scale. Chances are there have been hundreds or even thousands of civilizations within the observable sphere around us. Hell, there could be a civilization right now. The problem is, when we look through our telescopes, we are seeing hundreds of thousands, if not sometimes millions of years old information. We'll probably never know.
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