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always been one of the more interesting questions I thought. Its one of the issues some people use (like stephen hawkings) to show that the universe is dangerous. Maybe they all have to hide, because there are species that are like locusts (kind of like independence day). He has always had the stance that we shouldn't be letting our tv/radio signals just go out into space, broadcasting where we are.
But one thing that this doesn't seem to take into account is time. Space is huge. It's pretty obvious that statistically, its pretty much impossible for us to be "alone". But when you factor into it how "distance=time" in space, the chances of us ever existing parallel to anyone else within any real measurable distance is pretty much zero.
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