76 Module Introduction

“Since ’tis certain that Earth and Jupiter have their Water and Clouds, there is no reason why the other Planets should be without them. I can’t say that they are exactly of the same nature with our Water; but that they should be liquid their use requires, as their beauty does that they be clear.”

“This Water of ours, in Jupiter or Saturn, would be frozen up instantly by reason of the vast distance of the Sun. Every Planet therefore must have its own Waters of such a temper not liable to Frost.”

Christian Huygens– Discovered Saturn’s moon Titan in 1655

This module presents the Gas Giant Planets in our solar system: Jupiter, Saturn, Uranus, and Neptune, and their moons. We will examine characteristics of each Gas Giant planet, both similar and dissimilar characteristics.