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Gemini 9: when a fogged visor stopped the EVA

Cernan struggled to hold position while moving to the Astronaut Maneuvering Unit (AMU), a device intended to let him fly away from Gemini 9 using its own life support and rockets[1][2]. His exertion produced more moisture than his life-support system could remove, fogging his faceplate and blinding him[3]. He managed to put on the AMU by touch, but Thomas Stafford called him back inside before the planned AMU flight could take place, cutting the EVA short[4].

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