Apollo 11’s 200°F Sunlight

On July 20, 1969, Apollo 11 put Neil Armstrong and Buzz Aldrin on the Moon at Tranquility Base, where direct sunlight heated exposed surfaces to extreme temperatures. In later recollections of that first EVA, Armstrong described conditions as around 200°F, emphasizing how brutally hot the sunlit environment felt without an atmosphere to spread the heat. Mission reporting from Apollo also discussed temperatures around 180°F in the sun and deep cold in shadow. That is why the astronauts relied on reflective suits and life-support cooling to work outside at all.

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