Crossword Genius

Causes of some mysterious radar blips, in brief

Ross

I believe the answer is:

ufos

(Other definitions for ufos that I've seen before include "Supposed alien craft" , "Mysterious objects in sky" , "Roswell sightings?" , "Strange aerial objects" , "Initially, formal flying saucers" .)

I've seen this clue in The New York Times.
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