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This is a list of notable reported sightings of unidentified flying objects (UFOs) or unidentified anomalous phenomenon (UAP), and related claims of close encounters or abductions. UAP's are generally considered to include any perceived airborne, submerged or transmedium phenomenon that cannot be immediately identified or explained. Upon investigation, most UFOs are identified as known objects or atmospheric phenomena, while a small number remain unexplained. Antiquity 16th–17th centuries 19th century 20th century 1900–1949 1950–1974 1975–1999 21st century By location The lists below contain UFO reports mentioned above, along with less notable UFO reports from the specific areas. See also Table of reports during the 1947 flying disc craze – A sortable table of the hundreds of 1947 flying disc sightings. List of alleged extraterrestrial beings – A list of entities reported in conjunction with UFOs and believed by witnesses to be alien in origin, unrelated to astrobiology or xenobiology. List of UFO religions List of investigations of UFOs by governments List of UFO organizations – Private organizations that investigate UFO sightings. Extraterrestrial hypothesis – The proposal that UFO sightings are observations of physical craft piloted by biological aliens from another planet. Interdimensional hypothesis – The proposal that UFO sightings are the result of experiences with another dimension. Psychosocial hypothesis – The proposal that UFO sightings can be explained by social and psychological processes. Time-traveler hypothesis – The proposal that UFO sightings can be interpreted as advanced humans traveling from the future. Notes and references. Discover the Kara Powell Chap Clark popular books. Find the top 100 most popular Kara Powell Chap Clark books.