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The Galilean moons

A sibling set for 4 agents. Jupiter's four largest moons, discovered by Galileo in 1610. Four, by distance from Jupiter. Io is the volatile one and Ganymede is bigger than Mercury, so assign the orchestrator accordingly.

  1. 1IoInnermost; the most volcanically active body in the Solar System
  2. 2EuropaIcy surface, likely subsurface ocean
  3. 3GanymedeLargest moon in the Solar System, bigger than Mercury
  4. 4CallistoOutermost; heavily cratered, roughly equal rock and ice

Load this set onto the wheelRegister the first one

Order is by distance from Jupiter. Source: Galilean moons (Wikipedia), linked.