UFO, flying saucer, spaceship, alien craft.
"unidentified flying object." YourDictionary, n.d. Web. 26 February 2019. <https://thesaurus.yourdictionary.com/unidentified-flying-object>.
unidentified flying object. (n.d.). Retrieved February 26th, 2019, from https://thesaurus.yourdictionary.com/unidentified-flying-object
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