“Transient star-like items have actually been recognized in sky studies performed prior to the launch of the very first synthetic satellite on October 4, 1957,” stated Dr. Beatriz Villarroel of the Nordic Institute for Theoretical Physics (Nordita) and Dr. Stephen Bruehl from the Vanderbilt University Medical.

“These short-term transients– long lasting less than one direct exposure time of 50 minutes– have point spread functions and are missing in images taken quickly before the transients appear and in all images from subsequent studies.”

“In some cases several transients appear in a single image, displaying attributes not quickly represented by prosaic descriptions (e.g., gravitational lensing, gamma ray bursts, fragmenting asteroids, plate flaws).”

As part of their VASCO (Vanishing and Appearing Sources throughout a Century of Observations) job, Dr. Villarroel and Dr. Bruehl recognized more than 100,000 short-term, star-like ‘transients’ on photographic plates from the very first Palomar Observatory Sky Survey, performed in between 1949 and 1957.

They then compared the timing of these flashes with records of 124 above-ground nuclear tests and countless reported UAP sightings.

“Of the 2,718 days in this duration, transients were observed on 310 days (11.4%),” they stated.

“In the general sample, the variety of transients per date varied from 0 to 4,528, throughout several areas on numerous plates.”

“Above-ground nuclear weapons tests (United States, Soviet, and British) were carried out on 124 days (4.6%) throughout the research study duration.”

“UAP reports were taped in the UFOCAT database on 2,428 days throughout the research study duration (89.3%).”

The scientists discovered that the transients had to do with 45% most likely to take place on days within a one-day window of a nuclear test than on other days.

The result was greatest the day after a test, when the possibility of observing a short-term rose by approximately 68%.

The research study likewise reported a modest connection in between the variety of transients and the variety of UAP sightings taped on the exact same date.

For each extra sighting report, the variety of transients increased by about 8.5%, typically.

The group’s findings do not develop what the transients are, nor do they show a causal connection, however they challenge some standard descriptions.

The transients do not look like problems triggered by dust or radioactive contamination on photographic plates, the researchers keep in mind, and their timing– especially the peak one day after nuclear tests– does not healthy basic situations like particles from surges.

Rather, the authors lay out 2 broad possibilities.

One is that nuclear detonations might have set off formerly unacknowledged climatic phenomena efficient in producing quick, point-like flashes.

The other, more speculative, is that some transients might show items at high elevation or in orbit– possibly associated to the exact same occasions that produced UAP sightings.

The scientists highlight that both concepts stay unverified.

“Our findings supply extra empirical assistance for the credibility of the UAP phenomenon and its prospective connection to nuclear weapons activity, contributing information beyond eyewitness reports,” they stated.

“The possibility that some transients might represent UAP occasions in orbit recorded on photographic plates prior to the launch of the very first synthetic satellite can not be eliminated.”

“This research study contributes to the little peer-reviewed literature looking for to use organized clinical approaches to the research study of UAP-related information.”

“The supreme significance of the associations reported in the present work for improving understanding of transients and UAP stays to be identified.”

A paper on the findings was released on October 20, 2025 in the journal Scientific Reports

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S. Bruehl & & B. Villarroel. 2025. Transients in the Palomar Observatory Sky Survey (POSS-I) might be related to nuclear screening and reports of unknown anomalous phenomena. Sci Rep 15, 34125; doi: 10.1038/ s41598-025-21620-3