Sci-fi saucers, for short (4)

I believe the answer is:

ufos

(Other definitions for ufos that I've seen before include "Mysterious phenomena" , "Strange aerial objects" , "Unauthorised traffic from outer space?" , "Supposed spaceships" , "Roswell sightings?" .)

I've seen this clue in the Newsday.com and the Newsday.

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