UAP Codex · open research

79 years without an official explanation.

375 cases documented by governments, militaries and the press since 1947, each with its sources, its evidence tier and a comparable probability. It also includes the ones with an ordinary explanation, so you can see what is explained and what is not.

Explore the 375 casesHow likely each explanation is
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The scope

A documented collection of evidence, case by case.

375

Institutional cases

79

Years of phenomenon

75

Countries with records

See the global map · 75 countries →

UAP are not one single thing: they are several, mixed under the same label.

How the archive's 375 incidents split among the explanations (they sum to 100%)

Causa ordinaria probable, sin identificar: 18.4%Aeronave: 18.1%Objeto espacial: 9.9%Objeto astronómico: 9.6%Fenómeno natural: 7.5%Posible fraude: 7.5%Indeterminado: 6.7%Causa psicológica, médica o social: 5.3%Luz o actividad humana: 4.8%Animal: 3.4%Tecnología adversaria: 3.2%No humano: 1.9%Tecnología humana clasificada: 1.6%Fallo de instrumento: 1.6%Relato folclórico o literario: 0.5%18.4%18.1%9.9%9.6%7.5%7.5%6.7%
375cases
  1. Likely ordinary, unidentified18.4% · 69 cases
  2. Aircraft18.1% · 68 cases
  3. Space object9.9% · 37 cases
  4. Astronomical object9.6% · 36 cases
  5. Natural phenomenon7.5% · 28 cases
  6. Possible hoax7.5% · 28 cases
  7. Indeterminate6.7% · 25 cases
  8. Psychological, medical or social cause5.3% · 20 cases
  9. Human light or activity4.8% · 18 cases
  10. Animal3.4% · 13 cases
  11. Adversary technology3.2% · 12 cases
  12. Non-human1.9% · 7 cases
  13. Classified human technology1.6% · 6 cases
  14. Instrument artifact1.6% · 6 cases
  15. Folklore or literary account0.5% · 2 cases

Each incident counts once, under its most likely explanation. How it is calculated →

How the archive splits among the explanations →

Temporal distribution

Reports don't distribute randomly.
Four peaks mark institutional ruptures.

1947 Roswell — USAF creates Project Sign · 1973 US autumn wave (Pascagoula, Coyne) · 2004 Nimitz — F/A-18 ATFLIR video · 2026 PURSUE — first presidential disclosure.

Cases per year · 1947–2026

375 cases · 79 years

50

1950s

57

1960s

56

1970s

33

1980s

30

1990s

21

2000s

37

2010s

62

2020s

Walk the 375 cases chronologically →