unidentified flying object

:  not having a known or established identity :  not identified

:  moving or capable of moving in the air

:  moving or made by moving rapidly

:  very brief

:  travel by air

:  the operation of an aircraft or spacecraft

:  something material that may be perceived by the senses

:  something that when viewed stirs a particular emotion (such as pity)

:  something mental or physical toward which thought, feeling, or action is directed

:  to put forth in opposition or as an objection

:  to oppose something firmly and usually with words or arguments

:  to feel distaste for something

:  of, relating to, or being object code