I decided to have a gander at some NASA photos of our solar system and this is what I found.
Fun facts:
Ganeymede:
- possibly contains more water than Earth
- is the largest moon in our solar system - 26% larger than Murcury (but it's only 45% the mass of Murcury and doesn't have an atmosphere)
- is the only moon in our solar system with a magnetic field
Europa
- is slightly smaller than Earth's moon
- has the smoothest surface of any object in our solar system
