U F O is the abbreviation of unidentified flying object in English (i.e., "unidentified flying objects") refers to the physical or Visual phenomenon flies in the sky that could not identify what that is even after it has been widely studied. Many UFOS described the strange features, and was already speculation that UFOS are spacecraft built by extraterrestrial beings. Yet there is clear evidence in natural science that such a space existed, but there are many types of trace evidence is being discussed in the community
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