A nearly rounded celestial body that revolves around the Sun while rotating on its axis on an orbital path is called a planet. The inner planets are Mercury, Venus, Earth and Mars while the outer is Jupiter, Saturn, Uranus and Neptune.
The outer four planets are best described by:
Option C. They are large and made of mostly gas.
The planets can be explained as:
- In the outer planets, helium and hydrogen gases are present more compared to inner planets and are less rocky on the surface.
- The presence of gases makes the planet more big and large compared to rocky inner planets. They are gas giants because of too many gases.
- The outer planets have longer orbits as they are very large and are far away from the sun.
Therefore, outer planets are very large and mostly made up of gases.
To learn more about inner and outer planets follow the link:
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