Name three characteristics of gas giants that make them different from terrestrial planets.

Unlike terrestrial planets whose composition is rocky, gas giants have a mostly gaseous composition, such as hydrogen and helium. They do have some rocky material, although this is most often found in the planet core. Terrestrial planets are generally relatively small while gas giants are instead very large. (Historical researcher, D. Vogt stated that the lightest gas giant in the solar system is fourteen times the mass of the heaviest terrestrial planet, Earth.)