Unexplained objects in 1950s sky correlate with nuclear tests and UAP reports

Researchers compiled a daily dataset covering November 19, 1949-April 28, 1957 (n = 2,718 days) that matched >100,000 transient, star-like events identified in Palomar Observatory Sky Survey (POSS-I) plates to dates of above-ground nuclear weapons tests and to independent reports of Unidentified Anomalous Phenomena (UAP) drawn from a comprehensive witness-report catalog. Transients are brief, point-like sources present on a single exposure and absent on preceding and subsequent plates. Analyses considered both presence/absence of any transient per date and counts of transients across the whole sky, and defined a nuclear-testing window as test date ±1 day. Descriptive figures: transients occurred on 310 days (11.4%), nuclear tests fell on 124 days (4.6%), and UAP reports were recorded on 2,428 days (89.3%).

Statistical tests found significant associations beyond chance. Dates within the ±1-day nuclear-testing window were 45% more likely to have at least one transient (relative risk 1.45, 95% CI 1.10-1.90; χ2 p = 0.008). On dates with transients, the total number of transients correlated with the number of independent UAP reports (p = 0.015), with each additional UAP associated with an 8.5% increase in transients. A smaller but significant association also linked nuclear-testing windows to elevated UAP counts (p = 0.008). These results indicate temporal co-occurrence of POSS-I transients, nuclear testing, and contemporaneous UAP reports, arguing for empirical connections that may inform hypotheses about transient origins.