Ganymede
- Largest natural satellite in our solar system
- Relative Size- 3,273 miles in diameter
- Density- 1,93 g/cm3
- Mass- 1.4819x10 to the 23rd power kg
- Has a thin atmosphere
- Larger than Mercury and Pluto
- Named after a Trojan Prince
- Core of metallic iron
- Rock-like layer above core
- Crust of ice
- Has many crater-like spots
Callisto
- Third largest moon in our solar system
- Relative Size-2,995 miles in diameter
- Density- 1.83 g/cm3
- Mass- 1.0823x10 to the 23rd power kg.
- Slightly smaller than Mercury by 60 km.
- Most heavily cratered natural satellite in the solar system
- Has a very thin atmosphere
- Named after the daughter of the King of Arcadia
- Callisto is composed of water, ice, and rocky material.
Io
- Most volcanically active moon in our solar system
- Relative Size- 1,942 miles in diameter
- Density- 3.52 g/cm3
- Mass- 8.9319x10 to the 22nd power kg
- Slightly larger than Earth's moon.
- Very thin atmosphere that is not always there, and generated by a buildup of volcanic gases
- Named after the daughter of Inachus.
- Iron core
- Brown silicate outer layer which accounts for the splotchy surface.
- Volcanic activity is due to Io being squeezed and stretched while orbiting Jupiter. The surface can move up and down as much as 100 meters.
Europa
- Can possibly support microbial life in it's deep oceans
- Relative Size- 1,900 miles in diameter
- Density- 3.01 gm/cm3
- Mass- 4.8x10 to the 22nd power kg
- Smaller than Earth's moon, but larger than Pluto
- Does have an atmosphere composed solely of oxygen
- Europa is named after the daughter of the King of Tyre
- Iron core
- Rocky mantle
- Mantle surrounded by layer of ice
- Surface is covered by a frozen saltwater ocean