Here's why:
* Full Moon: During a full moon, the entire sunlit side of the moon faces the Earth. This means we see the largest illuminated portion of the moon, resulting in the brightest reflection.
* Other Phases: In other phases, such as the crescent or gibbous, only a portion of the moon's sunlit side is visible from Earth, leading to less reflected light.
While the full moon appears the brightest, it's important to note that the actual amount of light reflected from the moon is always the same. The difference in perceived brightness is due to the varying amount of the illuminated surface that is facing the Earth.