Did you know that God created light on the very first day of creation? (Genesis 1:3) But did you ever notice that God created the sun, moon, and stars on the fourth day? (Genesis 1:14)
What was the source of light the first 3 days of creation? Is that still the source of light, making the sun and stars be reflectors of light like the moon? Or did God put the light he created into the sun and stars? Or maybe he gathered up the light into the stars the same way he gathered the waters into oceans and seas.
If I think about this too long it becomes really mind boggling.