Throughout history people have witnessed a dizzying show of mysterious lights in the sky. Whether they are the devices of alien interlopers or more mundane weather phenomena, they have spawned a legacy of government inquiries, secretive...

Throughout history people have witnessed a dizzying show of mysterious lights in the sky. Whether they are the devices of alien interlopers or more mundane weather phenomena, they have spawned a legacy of government inquiries, secretive societies, and countless dedicated investigators. We call them "Unidentified Flying Objects," and they have claimed a prominent position in popular culture, enduring in part thanks to the legacy of researchers and persistently peculiar mysteries.