FBI UFO Speech1 cards

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In fact, whenever there were anomalies in the data for project Blue Book’s records, there was always an explanation In 1951, of the 169 reports only 13% of them were unidentified by the project’s officials However, the numbers jumped almost 9 fold to 1,501 sightings and 20% unidentified in 1952 This could have been due to the popular movie in

late 1951, The Day the Earth Stood Still A major spike happened again in 1957 when the numbers increased by 150% from 670 sightings to 1,006 sightings. The most likely explanation for this was that the Soviet satellite Sputnik was launched into space that year