Of all the moons of Jupiter, Callisto, Ganymede, Europa and Io tantalize us the most. These alien worlds of ice, fire, desolation and hidden oceans tantalize us with their possibility for extraterrestrial life and human exploration of the outer solar system. Join Robert and Joe for a mind bending exploration of the great gas giant's Galilean Moons.
Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htm
And to learn about your ad choices when listening to podcasts, visit
https://www.howstuffworks.com/privacy.htm#ad-choices
