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AI Summary
- Kenneth Arnold's 1947 sighting of multiple fast-moving tailless aircraft near Mount Rainier led to the coining of the term 'flying saucer' when describing their movement
- The incident sparked widespread public interest and media coverage, establishing the foundation for decades of UFO speculation and government investigation
- Arnold's credible account and the subsequent spread of his story marked the beginning of the modern UFO phenomenon and Roswell incident investigations
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