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Things You Thought You Knew – Where the Sun Don’t Shine
StarTalk Radio
Why is Our Sky Blue?
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On the moon's South Pole, the sun is low on the horizon, making the noon time sun also low. Some craters at the lunar South Pole never see sunlight because the sun does not get high enough to peer above the rim of the crater. On Earth, the blue appearance of our sky is due to sunlight scattering off air molecules, giving the perception of a clear blue sky. However, on the moon, which lacks an atmosphere and thus scattered light, shadows are pitch black.
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