Why have UFOs changed speed over the years?
Saucers flying like blue blazes are no longer a dominant part of our definition of a UFO experience either in film or lore. In an age where supersonic transports routinely cross the oceans, multi-mach jets are a staple item in every country’s military, and space shuttles regularly escape the bounds of earth, speed no longer seems so magical as it did at mid-century.
Levitation unassisted by helicopter rotors and rocket flames remains impressive and so defines alien-ness in a way high speed no longer can. Twelve hundred miles per hour is no longer incredible.
[Via]