Most accounts of UFO sightings can be explained by and attributed to normal earthly phenomena. Those that cannot be solved, however, have police investigators, government officials and researchers puzzled, even decades later in some cases.

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Authorities all over the world say UFOs are real, but what are they, and are they a threat? Featuring stories of impossible engineering and terrifying close encounters, this series examines the best and latest evidence caught on camera, as well as whistle blower and eye-witness testimony of this mysterious phenomenon.