In my opinion the ufo flight objects that exist, or notice, but was unable to determine exactly what it is, both by observers and investigations. UFO flight objects, although many could not be identified as unique. When the first notice, or when checking, but when examined again by a better way or with technology advancement. Back to determine whether an object is uniquely identified in some cases, airlines may be a natural phenomenon, and some cases may be man-made, unintentionally misleading or intentionally misleading fake. An object that contains the actual or observed, but cannot determine exactly what it is, both by observers and investigations.
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