Our World: Moon PhasesWhat causes the phases of the Moon? From New Moon to Full Moon, the Earth-Sun-Moon system is responsible for the Moon's changing phases. Learn more about rotation, revolution and this repeatable pattern. Includes video, background resources, and activities.NASA eClips™ Real World are short, relevant educational video segments for students. These videos explain science, engineering, and natural and designed world concepts.What is NASA eClips™?NASA eClips™ is a NASA-supporte