A History of Short Words

From the New York Times Crossword Puzzle

UFOS

Sun, 16 Jun '24
Sci-fi sightings
Thu, 29 Feb '24
Sightings of them can be reported on the Enigma app
Thu, 22 Feb '24
Focus of the U.S.A.F.'s Project Blue Book (1952-1969)
Sun, 15 Oct '23
Popular tabloid subjects
Wed, 8 Feb '23
Alien conveyances
Sun, 22 Jan '23
SETI subjects
Wed, 10 Aug '22
Sci-fi conveyances
Tue, 29 Mar '22
Alien transports
Mon, 18 Oct '21
Causes of some mysterious radar blips, in brief
Mon, 23 Aug '21
Interplanetary craft, for short
Tue, 11 May '21
Vehicles in some tabloid photos
Sun, 28 Mar '21
Ships passing in the night?