Found this image last week, and I found it to be very powerful. That is, of course, not a crescent Moon, but a crescent Earth. When viewed from the Moon and elsewhere, the Earth (from the Moon, an object 60% brighter than the Moon appears to us here) waxes and wanes through phases as the moon does, if in a less dramatic and much quicker manner.
This image was taken during the Apollo 11 mission. One of the requirements of the Google Lunar X Prize is that video of the moon be sent back, so perhaps within a decade we'll have ourselves a webcam of Earth to enjoy.
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