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Our skies are full of objects, natural and manmade, that are not as strange as you might think when you spot them from the ground. đź“ş Watch the full documentary, "What Are UFOs?": https://www.pbs.org/wgbh/nova/video/what-are-ufos/ đź“° Stay up to date on the latest science discoveries, full episodes, articles, videos, and more by signing up ...
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