The moon is not considered a source of light because it does not produce its own light. Instead, it reflects light from the sun.

Here's why:

* The Moon's Surface: The moon's surface is covered in a dusty, rocky material that absorbs some sunlight and reflects the rest.

* Reflection: The reflected sunlight is what we see as moonlight. The amount of light reflected depends on the angle of the sun's rays hitting the moon and the phase of the moon (new moon, full moon, etc.).

In essence, the moon acts like a giant mirror, reflecting the sun's light.