Definition: An unidentified flying object observed visually or by radar that does not appear to have a natural or manmade explanation.
Due to their fleeting and unpredictable appearances, photographs of UFOs are relatively rare.
Definition: An unidentified flying object observed visually or by radar that does not appear to have a natural or manmade explanation.
Due to their fleeting and unpredictable appearances, photographs of UFOs are relatively rare.