Much of the continent of the south-western portion of the United States is at a high altitude. To this add skies clear of light pollution, and the invisible wavelengths clear of much radio interference and you have an ideal set-up for astronomical research. The wide open spaces are also perfect for aeronautical and rocket research and the same wide open spaces - and consequential sparse population - possibly a natural setting for other matters to do with flying objects' - identified or otherwise...
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