UFO seen in Chicago in 1966

Summary

A civilian observer in Chicago, Illinois, reported in 1966 an object resembling a yoyo, stationary in the sky. The sighting lasted between 8 and 10 minutes, with no sound or visible trail. The object had white lights on top and sides, and was not identified with any known phenomenon. The Blue Book Project report indicated that the data was insufficient for evaluation, requesting more details from the witness. Despite no physical or photographic evidence, the testimony describes a clear and detailed experience.