The document discusses key facts about the moon, including that it orbits Earth and reflects sunlight from its surface. It also explains the phases of the moon, which are caused by the moon orbiting Earth as the sun lights different parts of its surface over the course of about 29 days. The moon's gravitational pull causes ocean tides on Earth. Diagrams show each moon phase as the portion of the lit surface visible from Earth changes from new to full to new again in a repeating cycle.