What's that up in the sky?With a flash of brilliant light, an object streaks wildly across the sky before suddenly vanishing.Around the world, hundreds of similar unidentified flying objects, or UFOs, have been spotted, photographed, and even seen on radar.Though many government officials and scientists have searched for answers that would explain these strange sightings, no conclusive explanations have been uncovered.For every sighting that can be dismissed as an unusual cloud formation, a weather balloon, or even a top-secret military aircraft, there are those that defy all logic.Could UFOs really be spaceships from another planet?
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