Word: ufo
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Dates: during 1960-1969
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Carl E. Sagan, Donald H. Menzel, and Richard E. McCrosky appeared on a CBS entitled UFO: Friend, Foe, or Fantasy, and they all emphasized the fantasy...
...Menze Paine Professor of Practical Astronomy, demonstrated how UFO's can be mirage-like effects of the earth's atmosphere. He used a container of benzene (symbolizing cold air) and acetone
Inspired by wild discrepancies in reports of earlier UFO sightings, Science Students Terry Warren, James Gould and Douglas Eardley decided to perform a complex "gullibility experiment." Working secretly in a steam tunnel under the Caltech campus, they rigged balloons out of polyethylene sheeting and filled them with an inert gas-probably helium. From the bottom of the balloons they suspended metal rods, each with fins and a railroad flare fastened to its lower...
...concluded that the evidence does not even remotely support the NICAP contention, that UFO'S are of extraterrestrial origin. The reports are simply explained as reflections from material objects such as balloons, planes, satellites or birds. Meteorological optics, such as mirages and sundogs account for many other sightings. Bright meteors, stars or planets are also responsible. Under special conditions, as studies clearly demonstrate, the observed "objects" can appear to move at fantastic speeds and display an ability to elude attempts of the observer to intercept it. Radar sightings are fully as subject to such vagaries as the optical sightings. There...
...repeat my own conclusions, with which the Air Force concurs. There is no evidence whatever to support the idea that UFO'S are manned extra-terrestrial vehicles. In fact the term UFO is itself a misnomer. The sightings are no longer "Unidentified." They are not always "Flying." And many of them, like mirages or sundogs, are not even "Objects." Donald H. Menzel Director of Harvard College Observatory