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a flying saucer. the sunlight," the scientist noted. "Then | noticed a third and similar object, less bright, possibly because it was in the shade of the same cloud mass. Certainly they were not caused by any optical or meteorological peculiarities." Last year, Dr. Carl Sagan, a top-ranked United States astronomer, saw no reason to be vague about the possibility of extra-terrestrial space craft having visited our planet. "The statistics that we now possess," Dr. Sagan said, "suggest that the Earth has been visited by representatives from various galactic civilizations many times." Leading exobiologists (scientists who study lifeforms outside the earth) have concluded that in this galaxy alone, there are quite possibly some 640,000,000 life-bearing planets. That figure alone seems staggering, but bear in mind that there are billions of other galaxies. Dr. Sagan thinks it not the least bit out of line to assume that as many as 1,000,000 planets in this galaxy may support advanced civilizations similar to that of the earth. "These creatures have doubtlessly been sending explorative expeditions through interstellar space for countless milleniums," Dr. Sagan believes. "It is not out of the question that some kind of base is maintained within the solar system to provide continuity for successive expeditions. An obvious spot for such a base is our own moon." In November of 1955, Frank Halstead, curator of the University of Minnesota observatory at Duluth, sighted two flying saucers. Accepting the shock to his own theories with the attitude of a true scientist, Halstead remarked: "All over the world credible witnesses are reporting experiences similar to mine. Holding these people up to ridicule does not alter the existing facts. The time is long overdue for accepting the presence of these things, whatever they are, and for dealing with them and the public on a basis of honesty and realism." And credible witnesses have truly been reporting unidentified flying objects similar to Frank Halstead's for many years. On August 12, 1883, Senor Jose Bonilla, director of the observatory at Zacatecas, Mexico, had set up his camera to photograph sun spots. He got quite a different series of pictures from those he had expected. He has the honor of being the first professional astronomer to take a picture of