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We'll find evidence of intelligent life outside of our planet soon enough. We just don't have technology advanced enough yet. Most people don't fully grasp just how huge the universe truly is.
I'm sure some intelligent life has eradicated itself but surely not all. I absolutely believe there are other advanced civilizations out there. If there were an intelligent race 1,000 light years away that sent us a signal at this very moment we wouldn't even receive it for at least 1,000 years, and that's assuming they sent it at the speed of light.
I'm sure we'll get a signal someday. That, or they'll just show up.
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