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Mysterious Flashes in 1950s Skies Linked to Nuclear Tests and UAP Sightings: Study

Apr 10, 2026, Sci News, by Natali Anderson

A new statistical analysis of archival sky surveys from the early Cold War has found that mysterious, short-lived bursts of light in the night sky were more likely to appear around the time of above-ground nuclear weapons tests and to increase alongside reports of unexplained aerial phenomena (UAPs).

“Transient star-like objects have been identified in sky surveys conducted prior to the launch of the first artificial satellite on October 4, 1957,” said Dr. Beatriz Villarroel of the Nordic Institute for Theoretical Physics (Nordita) and Dr. Stephen Bruehl from the Vanderbilt University Medical Center.

“These short-lived transients — lasting less than one exposure time of 50 min — have point spread functions and are absent in images taken shortly before the transients appear and in all images from subsequent surveys.”…………………………………….

“Above-ground nuclear weapons tests (US, Soviet, and British) were conducted on 124 days (4.6%) during the study period.”

“UAP reports were recorded in the UFOCAT database on 2,428 days during the study period (89.3%).”

The researchers found that the transients were about 45% more likely to occur on days within a one-day window of a nuclear test than on other days.

The effect was strongest the day after a test, when the likelihood of observing a transient rose by roughly 68%.

The study also reported a modest correlation between the number of transients and the number of UAP sightings recorded on the same date……………………………………………..

This study adds to the small peer-reviewed literature seeking to apply systematic scientific methods to the study of UAP-related data.”

“The ultimate importance of the associations reported in the current work for enhancing understanding of transients and UAP remains to be determined.”

A paper on the findings was published on October 20, 2025 in the journal Scientific Reports. https://www.sci.news/astronomy/cold-war-transients-14688.html

April 14, 2026 - Posted by Christina Macpherson | space travel