Reported Flashes Became Rarer Where Earth Blocked the Sun

Before Sputnik, astronomers surveyed the sky by exposing large photographic plates through telescopes. Each exposure preserved the positions of stars and any brief points of light bright enough to register during those minutes. The Palomar survey originals were also reproduced as glass copy sets for use at other observatories. Modern catalogues used in this research were built from digitized scans of those copies. That preserved the sky well enough to measure it again, but the copying process also created one of the central artifact questions in the dispute.

A star produces its own light. It does not disappear because Earth's shadow falls across nearby space. An object seen because it reflects sunlight is different. If Earth moves between that object and the Sun, sunlight no longer reaches it, so its reflection should disappear from the photograph.

Researchers took transient candidates from the first Palomar Observatory Sky Survey and calculated where Earth's shadow would have crossed each photographed field if the sources were at different distances from Earth. This was not a distance measurement of any individual flash. It was a population test: at what assumed distance, if any, did the recorded flashes become rarer inside the calculated shadow?

The strongest reported deficit appeared at geosynchronous distance. Far fewer candidates were found where Earth's shadow would have blocked sunlight from objects in that region of space. The tested orbit has a radius of 42,164 kilometers from Earth's center, approximately 35,786 kilometers above the surface.

That gives the observation physical meaning. If the candidate flashes are real sky events, the distribution behaves as reflected light should behave near the altitude now occupied by geosynchronous satellites. The analysis does not show what produced the reflections, and it does not measure the distance to any individual source.