Why does the Moon's face change?
When we look into the sky, the thing that appears to change most from night is the Moon. But the Moon itself does not change shape. What we see is the Sun's light reflected off the Moon (the Moon generates no light of its own),and this reflection changes as the Earth and the Moon move around the Sun. At the beginning, of the lunar month, the new moon, the lit side of the Moon faces away from Earth, so we see nothing. The portion of the Moon that we can see grows, or waxes, first into a thin silver or crescent, then it grows smaller, or wanes, in a reversal of the process.

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