Why does the Moon Change Shape?

When can we see the moon?

Waning moon
Waning moon
Waxing Moon
Waxing Moon

One side of the moon is always lit up by the sun but, it is not always visible to us. As the moon orbits Earth it goes through phases.

The phase of the moon is how much of the moon appears to be lit up by the sun while looking from here on Earth. A phase lasts about 28 days.
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