The R-UFO hypothesis means “residual unidentified flying object” hypothesis and basically recognizes that of all the UFO reports there is a residual 10% or so that cannot be explained away. Ancient Astronaut theorists would have us believe that these are space aliens from other planets. Yet that idea was dealt a hard blow this week as Dr. Howard Smith, a senior astrophysicist at the Harvard-Smithsonian Center for Astrophysics, has stated unequivocably that alien life is highly improbable. In an article at the Telegraph he stated “We have found that most other planets and solar systems are wildly different from our own. They are very hostile to life as we know it.” This is not good news for proponents of ancient astronaut theory whom I have criticized recently for their incoherent arguments. Dr. Hugh Ross agrees and has argued similarly in his book Lights in the Sky & Little Green Men: A Rational Christian Look at Ufos and Extraterrestrials .
Yet there seems to be evidence of otherworldly visitations and even contact with strange beings. I believe this is best explained by the spiritual entity, inter-dimensional being hypothesis. I recently found a series of videos put on by the Reasons to Believe science/faith think tank on the R-UFO hypothesis. It is hosted by one of my favorite Christian apologists Greg Koukl and features Astrophysicist Dr Hugh Ross and theologian/philosopher Kenneth Samples. It is a series of four programs which consist of several YT segments each, the last program (parts 9-12) explains the inter-dimensional hypothesis and the high probability that what is being reported is the same phenomenon that was regarded as demonic in antiquity.
Here is a playlist of all 12 parts