The orbital periods of the three inner moons are as follows: Io, 1.769 days; Europa, 3.551 days; Ganymede, 7.155 days. If you divide these periods by Io's period, you find that they are almost ...

Orbital period, which is the time required to complete one orbit about the primary body, is proportional to orbital energy. Therefore, as the spacecraft's orbital period increases (the slingshot ...