From religious beliefs and legends to movies and TV shows, from advertising and celebrities to Internet sites and photo ops, this illustrated A-Z encyclopedia makes it easy to locate each topic, and the opportunities for further research assure its timeliness. * Includes an introduction providing a detached, coherent assessment of the UFO phenomenon, tracing its origins to the 19th century and earlier * Provides an extensive chronology including an appendix on Heaven’s Gate and UFO-related organizations and periodicals