The two major hypotheses attempting to explain UFOs are the Extra-Terrestrial Hypothesis (ETH) which posits that UFOs contain beings from elsewhere in space, and the Inter-Dimensional Hypothesis (IDH) which posits that the “visitors” are not part of our physical universe but are from another dimension. | The two major hypotheses attempting to explain UFOs are the Extra-Terrestrial Hypothesis (ETH) which posits that UFOs contain beings from elsewhere in space, and the Inter-Dimensional Hypothesis (IDH) which posits that the “visitors” are not part of our physical universe but are from another dimension. |