ANSWER: Only 2
Explanation:
- The Galilean moons are the four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto.
- They were discovered by Galileo Galilei around January 1610 and were the first group of objects found to orbit another planet.
- Ganymede is the largest moon in the Solar System, and is even bigger than the planet Mercury. The three inner moons—Io, Europa, and Ganymede—are in a 4:2:1 orbital resonance with each other.