Seventy-year-old reports of mysterious lights in the sky—so-called 'unidentified anomalous phenomena' (UAP), what would have once been dubbed a 'UFO'—may be linked to nuclear weapons testing.

This is the conclusion of researchers who scanned historical photographs taken from the Palomar Observatory in California between 1949 and 1957 and identified various mysterious and short lived bright spots in the sky.

The so-called 'transient objects'—which appear in one photo only to be gone by the next time the same region of the night sky was captured—were found to appear on dates that correlate strongly with both reported UAP sightings and nuclear tests.

All of the photographs were taken before October 4, 1957—when humanity's first artifical satellite, Sputnik 1, was launched into Earth orbit.

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