The term UFO is an acronym for Unidentified Flying Object. That's it. It doesn't automatically mean a spaceship from another planet. It simply refers to any object seen in the sky that the observer cannot immediately identify.

While tales of strange things in the sky are as old as humanity, the modern UFO phenomenon began in earnest after World War II. The boom in aviation and the anxieties of the Cold War created a fertile ground for such sightings. The term "flying saucer" entered popular culture in 1947 after private pilot Kenneth Arnold reported seeing nine shiny, unidentified objects flying past Mount Rainier at high speed. He described their movement as being like a saucer skipping across water, and the name stuck.

Studying UFOs isn't just a hunt for extraterrestrials. It's a look into a fascinating intersection of psychology, sociology, and technology. How do our brains interpret things we don't understand? How do stories and beliefs spread through society? What can sightings tell us about our own technological capabilities, from military drones to atmospheric effects?

Governments and scientific organizations have taken these questions seriously over the years, launching official investigations to sort fact from fiction. The goal is often to identify potential national security threats or to understand unexplained atmospheric phenomena.

This course provides a broad overview of the UFO phenomenon. We will look at some of the most famous historical cases and examine the evidence associated with them. We'll then explore how these sightings have shaped our culture, from blockbuster movies to modern myths.

Finally, we will explore the tools of investigation, learning how experts analyze sightings and sift through data to separate the known from the truly unknown. The journey is not about finding definitive proof of aliens, but about understanding a complex and enduring human mystery.