A History of Short Words

From the New York Times Crossword Puzzle

UFO

Thu, 5 Sep '24
What a high-altitude balloon might be mistaken for
Mon, 12 Aug '24
Sci-fi ship
Thu, 18 Apr '24
Visitor from a faraway place
Wed, 14 Feb '24
Sci-fi sky sighting
Fri, 9 Feb '24
Frequent conspiracy subject
Mon, 3 Jul '23
Alien's ride, for short
Wed, 29 Mar '23
Supposed Roswell crasher
Sun, 5 Mar '23
It might turn out to be a drone
Fri, 10 Feb '23
Klaatu's vehicle in "The Day the Earth Stood Still"
Tue, 31 Jan '23
Mysterious sky sighting
Thu, 4 Aug '22
Dish seen around the world?
Tue, 25 Jan '22
Peculiar light in the sky, in brief
Sun, 17 Oct '21
Ship for 28-Across
Thu, 14 Oct '21
World traveler?
Thu, 4 Mar '21
Space oddity
Wed, 24 Feb '21
What Venus is sometimes mistaken for, due to its brightness
Sat, 13 Feb '21
Subject of many a conspiracy theory