Explanation:
What's happening to the Moon? Drifting around the Earth in 2006 July,
astronauts from the International Space Station (ISS) captured a crescent Moon
floating far beyond the horizon. The captured above image is interesting
because part of the Moon appears blue, and because part of the moon appears
missing. Both effects are created by the Earth's atmosphere. Air molecules more
efficiently scatter increasingly blue light, making the clear day sky blue for
ground observers, and the horizon blue for astronauts. Besides reflecting
sunlight, these atmospheric molecules also deflect moonlight, making the lower
part of the moon appear to fade away. As one looks higher in the photograph,
the increasingly thin atmosphere appears to fade to black.
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