Haunebu (Nazi UFO)
A disc-shaped aircraft said to have been secretly developed by Nazi Germany during World War II. It is said to have flown by anti-gravity, but the story spread through postwar publications, and no documents show it existed.
Mystery Timeline｜1989–present
Mysteries of the Heisei & Reiwa
Scary stories born on internet forums, the filming of deep-sea creatures, UAP hearings and other mysteries from 1989 to the present.
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Spread from the 1990s on
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1990s onward
Reptilians
Reptilian aliens said to disguise themselves as humans and secretly rule society. Known from a conspiracy theory that spread from the 1990s, it has no basis and has been criticized for overlapping with discriminatory conspiracy theories.
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1997
Phoenix Lights
The incident on the night of March 13, 1997, in which thousands of people around Phoenix, Arizona, saw lights in a V formation and a huge object. Lights later in the night were explained as military flares, but the earlier sightings are still debated.
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2020s
UAP (Unidentified Anomalous Phenomena)
The term "unidentified anomalous phenomena" used by the U.S. government and others in place of UFO. In 2020 the Department of Defense released Navy footage, and in 2022 a dedicated investigative office, AARO, was established.
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2023
The "Alien Mummies" of the Mexican Congress
Small mummies presented as "non-human bodies" at a UFO hearing of the Mexican Congress in September 2023. They were claimed to have been found near Nazca, Peru, but scientists pointed out one after another that they appear to be fakes assembled from human and animal bones.
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2010s–2020s
Open Contact
The theory that the day is near when the existence of aliens (extraterrestrial life) will be officially revealed and open interaction with humanity will begin. It spread through repeated discussion on the Japanese TV program Yarisugi Toshi Densetsu. It comes up together with U.S. congressional UAP hearings, but the existence of aliens has not been officially confirmed.
