In the Moon he has light

The Solar System appeared from a Nebula (intent cloud of interstellar substance) Protosolar, that was a gas cloud and dust in slow rotation where through condensation of this cloud celestial granddaughters, moons and other bodies had appeared pla that had started to turn around the Sun.

The Moon also formed together with the planets, as well as them and as the Sun, it is approximately spherical.

The Sun has proper light as well as all the stars, the planets does not have proper light and is illuminated by the Sun, the Moon is as a planet and also it is illuminated by it. The Moon reflects the light of the Sun and is therefore we see that it to shine at night.