A groundbreaking statistical analysis of archived sky surveys from the early Cold War reveals that enigmatic, short-lived bursts of light in the night sky are likely to coincide with ground-based nuclear weapons tests and rise in correlation with reports of Unexplained Aerial Phenomena (UAPs).
Four exposures of a 3 x 3 arc minute area of the sky centered on a triple transient identified in July 1952. Top left: POSS I red image from July 19, 1952 at 8:52 (UT) showing a triple transient just above center. Top right: 10 m exposed POSS I blue image taken immediately after. No evidence of a triple transient is present. Bottom left and right: POSS I red (left) and blue (right) images captured two months later (September 14, 1952), with transients still visible. Image credit: Solano et al., doi: 10.1093/mnras/stad3422.
“Sky surveys conducted prior to the launch of the first artificial satellite on October 4, 1957 identified transient star-like objects,” stated Dr. Beatriz Villarroel from the Nordic Institute for Theoretical Physics (Nordita) and Dr. Stephen Brühl of Vanderbilt University Medical Center.
“These short-lived transients (lasting less than 50 minutes) display a point spread function that is absent in preceding images and all subsequent surveys.”
“In several instances, multiple transients are observed in a single image, featuring characteristics that defy conventional explanations such as gravitational lensing, gamma-ray bursts, fragmenting asteroids, and plate defects.”
As part of the VASCO (Sources of Vanishing and Appearing Over a Century of Observations) project, Dr. Villarroel and Dr. Brühl identified over 100,000 short-lived star-like “transients” on photographic plates from the initial Palomar Observatory sky surveys conducted from 1949 to 1957.
They then correlated the timing of these flashes with a record of 124 ground-based nuclear tests and thousands of reported UAP sightings.
“Across 2,718 days during this period, transient phenomena were observed on 310 days (11.4%),” they reported.
“The count of transients per date varied from 0 to 4,528 across multiple locations and plates.”
“Terrestrial nuclear weapons tests (conducted by the US, USSR, and UK) occurred on 124 days (4.6%) during the study period.”
“UAP reports were logged in the UFOCAT database for 2,428 days during the study period (89.3%).”
The researchers noted that transients were approximately 45% more likely to occur on days within one day of a nuclear test compared to other days.
This effect peaked the day after nuclear testing, increasing the likelihood of witnessing a transient by about 68%.
The study also indicated a moderate correlation between the frequency of transients and the number of UAP sightings recorded on the same day.
For each additional reported sighting, the incidence of transient phenomena rose by about 8.5% on average.
While the researchers’ findings do not confirm what the transient phenomenon is or prove a causal link, they challenge several conventional explanations.
Scientists assert that the transient phenomenon differs from defects caused by dust or radioactive contamination on photographic plates. Additionally, its timing, notably its peak on the day post-nuclear tests, doesn’t align with simpler scenarios like debris from an explosion.
Consequently, the authors propose two major possibilities:
One possibility is that nuclear explosions may trigger previously unidentified atmospheric phenomena that create brief, point-like bursts of light.
The other, more speculative idea suggests that some transients may reflect high-altitude or orbital objects, possibly related to the same event that led to UAP sightings.
The researchers emphasize that neither hypothesis is currently proven.
“Our findings lend further empirical support to the legitimacy of the UAP phenomenon and its possible connections with nuclear weapons activity, augmenting data beyond mere sighting reports,” they concluded.
“We cannot dismiss the likelihood that some transients represent on-orbit UAP events captured on photographic plates prior to the first satellite launch.”
“This study enriches the limited peer-reviewed literature striving to employ systematic scientific methods in analyzing UAP-related data.”
“The ultimate implications of the associations discussed in this study for enhancing our understanding of transient phenomena and UAPs still require further investigation.”
A research paper detailing these findings was published in the journal on October 20, 2025. Scientific Reports.
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S. Brühl & B. Villarroel. 2025. Palomar Observatory Sky Survey (POSS-I) transients may relate to nuclear tests or reports of unidentified anomalous phenomena. Science Officer 15, 34125; doi: 10.1038/s41598-025-21620-3
Source: www.sci.news
