Unidentified flying object seen in Greenfield Massachusetts in 1947

Summary

In June 1947, an unidentified object was observed in Greenfield, Massachusetts. The report indicates that the object was round and irregular, and was seen for about 8 to 10 seconds. The observation was visual and from the ground, with no confirmed physical evidence or photographs. Despite various theories, from balloons to rockets, no clear explanation was reached. Investigators concluded it was non-astronomical and no evident explanation was found.