No atmosphere to moderate it.
The lack of atmosphere on the moon accounts for the great differences in temperature. On Earth, the atmosphere acts as a kind of blanket that holds in incoming heat from the sun. The moon, with its lack of atmosphere, does not retain heat as well as the Earth. The rotation of the moon also affects the temperature. The moon takes 27 days to rotate on its axis meaning that the moon experiences 13 days of sunlight then 13 days of darkness which creates a dramatic change in temperature.
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