Attribution & sources
Demodle is the dailies spine demo. Its dataset is a small hand-written set of Solar System bodies (the eight planets, Pluto, and three well-known moons) with publicly known physical facts used for teaching purposes.
Real games in this family carry per-source attribution here (Wikidata CC0, Wikipedia CC BY-SA, GVP, NOAA/NASA public domain). This demo invents no data.