Interdimensional UFO hypothesis

The interdimensional UFO hypothesis (IUH) is the proposal that unidentified flying object (UFO) sightings are the result of experiencing other "dimensions" or "portals" that coexist separately alongside our own. The hypothesis has been advanced by ufologists such as Meade Layne, John Keel, J. Allen Hynek, and Jacques Vallée. Proponents of the interdimensional hypothesis argue that UFOs are a modern manifestation of a phenomenon that has occurred throughout recorded human history, which in prior ages was ascribed to mythological or supernatural creatures. Jeffrey J. Kripal, Chair in Philosophy and Religious Thought at Rice University, writes: "this interdimensional reading, long a staple of Spiritualism through the famous 'fourth dimension', would have a very long life within ufology and is still very much with us today".