UFO seen over Las Vegas in 1957

Summary

A round, yellowish object was spotted over Las Vegas in 1957. A civilian witness described it as the size of a half-dollar coin and observed it for 5 to 7 seconds. The object was seen moving behind the mountains, but no photos were taken. Although several explanations such as balloons or meteors were considered, no definitive conclusion was reached. The report concluded that there was insufficient data to evaluate the phenomenon with certainty.