**Acknowledgements**

This research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.

*Aerospace Engineering*

ocean to the surface of the moon.

region of Enceladus. Hot water traveling upward from the ocean comes into contact with cooler water, which is eventually expelled through the vents that connect the

**146**

**Figure 13.**

*Titan's sea and lake organic compounds.*

**Figure 12.**

**Figure 11.**

*Enceladus moon hydrothermal activity (image credit: NASA/JPL-Caltech).*

*Six of Saturn's unique moons (image credit: NASA/JPL-Caltech/Space Science Institute).*
