Each concept here is mapped to its prerequisites — the ideas you'd need first to understand it — all the way down to four foundations: Space, Time, Energy, Pattern. Click any prerequisite to drill down, or scroll for the chain graph.
The moon is a natural satellite that orbits a planet due to gravitational attraction, as planets are massive, self-gravitating celestial bodies that exhibit patterns of motion around a central point.
External reference — all senses of the word “moon” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.