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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. 📺 Watch the full documentary, "What Are UFOs?": https://www.pbs.org/wgbh/nova/video/what-are-ufos/ 📰 Stay up to date on the latest science discoveries, full episodes, articles, videos, and more by signing up ...
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