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There are two separate things that need to be addressed. One is the surface area of the Moon. The other is the surface area of the NEAR SIDE of the Moon.

As a sphere in space, the Moon is always 50% illuminated, except during lunar eclipses.

The phases of the Moon measure what percentage of the NEAR SIDE of the Moon is illuminated. At the new moon, none of the near side is lit up; at the full moon, 100% of the near side is illuminated.

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Q: How many percent illuminated is full moon?
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