Phoenix Lights UFO sightings (1997)

On March 13, 1997, thousands of people across the Phoenix metropolitan area reported seeing a series of mysterious lights in the sky now known as the Phoenix Lights. Numerous witnesses recorded videos that were widely shared online, making the incident one of the most internet-famous UFO events in U.S. history. Explanations have included military flares from training exercises at nearby ranges and aircraft, and the cause remains debated among researchers and witnesses.