Explanation of the May 1964 Downers Grove Grey Elliptical UAP

Determine the physical origin of the grey, elliptical object observed around 10:15 AM CDT in May 1964 over Downers Grove, Illinois, characterized by silent motion, lack of lights, side-to-side movements, a sudden southward shift by many tens of degrees in approximately one second, and subsequent “falling leaf” motion, as reported by Kevin Krisciunas and other student witnesses.

Background

The paper provides a detailed eyewitness account from author Krisciunas describing a daytime sighting in 1964 of a grey, elliptical object exhibiting unusual motion without sound or lights, corroborated by other students present at the school playground.

Despite the detailed description, the authors explicitly note that the event has remained unexplained to this day, marking it as an unresolved case suitable for targeted investigation.