Historical clue formulations

• Mysterious sight at night — 2026-08-04
• Subject of a declassified Pentagon document, in brief — 2026-06-17
• Purported sighting recorded by Puritan governor John Winthrop in 1639 — 2026-03-29
• What a drone might be mistaken for — 2026-03-12
• Frequent conspiracy subject — 2025-10-15
• Familiar initialism coined by a U.S. Air Force captain — 2025-09-28
• Strange sighting in the night sky — 2025-08-18
• What arrives in the film "Arrival" — 2025-08-07
• ET's vehicle — 2025-04-07
• E.T. arrived in one — 2025-04-01
• Something studied by the Advanced Aerospace Threat Identification Program, for short — 2024-12-18
• Subject of many a grainy video — 2024-11-07
• What a high-altitude balloon might be mistaken for — 2024-09-05
• Sci-fi ship — 2024-08-12
• Visitor from a faraway place — 2024-04-18
• Sci-fi sky sighting — 2024-02-14
• Frequent conspiracy subject — 2024-02-09
• Alien's ride, for short — 2023-07-03
• Supposed Roswell crasher — 2023-03-29
• It might turn out to be a drone — 2023-03-05
• Klaatu's vehicle in "The Day the Earth Stood Still" — 2023-02-10
• Mysterious sky sighting — 2023-01-31
• Dish seen around the world? — 2022-08-04
• Peculiar light in the sky, in brief — 2022-01-25
• Ship for 28-Across — 2021-10-17
• World traveler? — 2021-10-14
• What Venus is sometimes mistaken for, due to its brightness — 2021-02-24
• Subject of many a conspiracy theory — 2021-02-13
• Sighting aptly found in "Are you for real?" — 2020-11-08
• What a weather balloon might be mistaken for — 2020-10-18
• Saucer, perhaps — 2020-09-09
• Sci-fi sighting — 2019-11-27
• Weather balloon, maybe — 2019-11-16
• Craft in a close encounter — 2019-08-04
• 1950s Project Blue Book subject, for short — 2018-12-26
• What a weather balloon might be mistaken for — 2018-07-11
• Saucer in the sky, for short — 2018-06-04
• Something encountered in "Close Encounters of the Third Kind" — 2018-01-25
• Dish that's out of this world? — 2017-12-23
• Subj. of some conspiracy theories — 2017-11-11
• Subject of a tinfoil hat theory — 2017-02-26
• X-File subject — 2017-01-29
• Craft the U.S. government has never recognized — 2016-09-11
• Otherworldly craft, for short — 2016-06-13
• "The Day the Earth Stood Still" craft — 2016-05-20
• Eerie sky sighting — 2016-01-06
• Cause of some 911 calls — 2015-07-09
• Alien's transport, for short — 2015-02-09
• Aerial anomaly — 2014-12-11
• Subject of certain amateur vids — 2014-12-03