• Io, super dense and free of water
    Io, super dense and free of water
  • Europa, big ball of ice that’s maybe suitable for life?
    Europa, big ball of ice that’s maybe suitable for life?
  • Ganymede, the iron-rich big boy
    Ganymede, the iron-rich big boy
  • Callisto, the most dinged-up object in the solar system
    Callisto, the most dinged-up object in the solar system
37 votes