* Size: The sun is a massive star, much larger than the moon. It's about 109 times wider than Earth, while the moon is only about 1/4 the size of Earth.

* Composition: The sun is mostly made of hydrogen and helium, while the moon is mostly rock and dust. This means the sun has far more material packed into its volume.

Roughly speaking, the sun's mass is about 333,000 times greater than the moon's mass.