Photo borrowed from April Rossi's FB feed. How do UFOs power their craft? There is no visible exhaust or vapor trail. They can hover noiselessly and travel very fast from one point to another. They literally defy gravity and have the ability to withstand the g forces of abrupt maneuvers. They can also be seen to simply dematerialize or materialize. To travel even to the nearest star system would take years at subluminal speeds. Various mediums and authors have talked about at least two different designs of machines that produce more power than is fed into them. There also appear to be some that are nuclear powered although those may be built by humans. We have been reverse engineering recovered craft for at least 60 years so I assume we've made some progress. The technology has been kept from the public on purpose. The people that control our world have a vested interest in continuing with oil as our basis for fuel.