What is the origin of 'sleep tight'? One of the mysteries of the English language finally explained.
The moon doesn't glow in a very real sense. It reflects the Sun's light. (Or the Earth's light if you're not on Earth and in the right position.) As Quora User says, the moon has a high albedo. So it reflects pretty well.
The Moon is not a light source, it does not make its own light. The moon reflects light from the sun. We can see the Moon because light from the Sun bounces off it back to the Earth. If the Sun wasn't there, we wouldn't be able to see the Moon. The Sun always lights up (illuminates) one side of the Moon.