Hynek's UFO framework, developed from late 1940s analyses, classifies encounters as close encounters of the first, second, and third kind, later adding abduction (fourth kind) and communication with non-Earth life (fifth kind… #aliens #howstuffworks #ovni #pascagoula #uap #ufo #ufosky #usa #wyoming https://science.howstuffworks.com/space/aliens-ufos/ufo-classification.htm