EXETER, N.H. — Fifty years ago, a frightened 18-year-old high school graduate and future Navy sailor named Norman Muscarello told police in New Hampshire he had seen an unidentified flying object.

The event that became known as "The Incident at Exeter" sparked an Air Force investigation and became one of the nation's most celebrated and scrutinized sightings.

The Exeter UFO Festival that runs through this weekend brings together a gathering of notable UFO-logists, true believers, skeptics and the merely curious to raise money for kids' charities and talk about what happened that night.

The Air Force said the sightings were either a mirage caused by a temperature inversion or one of five B-47 planes in the area at the time. A definitive answer was never given.