It was believed by earlier civilizations that the moon emanates its own light. Science now tells us that the light of the moon is reflected light. However, this fact was told to us in the Quran 1400 years before it was discovered.

It is He Who made the Sun to be a shining light, and the Moon to be a reflected light,... (Quran 10 : 5)

Have you ever thought, How could Muhammad PBUH have possibly known all this 1400 years ago, when scientists have only recently discovered it?