1. (…Link for the Latest Statistics on the Moons of Jupiter...)

7. Callisto

9. Callisto is the most heavily cratered object in the Solar System…
No Internal or Volcanic Activity, No Erosion…
Oldest Surface! (Longest Unchanged, other than Cratering)

12. Ganymede

13. The Varied Terrain of Ganymede…
Signs of Tectonic Activity,
due to internal dynamics
in the Moon!

14. Ganymede… The Largest Moon in the Solar System…
(Bigger than Planet Mercury!)
The Only “Moon” with a Magnetic Field , because…
Internal Layers & Activity, Partially Molten Inside!

15. Ganymede Saline Water Layer, an Electrical Conductor…
Generates Ganymede’s Magnetic Fields!

17. Europa

19. Europa’s Shifting Surface…
 Likely Molten Interior Under the Ice!

20. Europa’s Liquid Water (H2O) ocean under its icy surface
may contain more water than all of Earth’s oceans combined!

22. Different Colors…
 Different Chemical Composition / “Ingredients”

23. Food & Energy from Below: Life at Earth’s Hydrothermal Vents

27. Current Mission Plan by the European Space Agency (ESA):
The “JUICE” Satellite (…along w/NASA’s “Europa Clipper”!)
(Plan: Launch 2022, Arrival 2030; Ganymede Orbiter, Flybys of Callisto & Europa)

29. Io

31. Unlike our moon Luna,
Io cannot synchronize
its Rotation to its Orbit
to eliminate Tidal Friction!

32. Model of the possible interior composition of Io
with an inner iron or iron sulfide core (in gray),
an outer silicate crust (in brown),
and a partially molten silicate mantle in between (in orange)

33. Prometheus is the site of a volcanic eruption that has been
ongoing since at least the Voyager 1 encounter in 1979!

34. Constantly “Re-Paved” by Volcanic Activity,
Io has the Youngest Surface in the Solar System!

35. Io, “The Tormented Moon”

36. Io’s Plasma Torus

38. Four completely different “Worlds”!
The Galilean Moons…
Four completely different “Worlds”!