What are the outer planets composed of?

Options

A. Ice
B. Rocks
C. Dirt
D. Gases

Answer

**Step-by-Step Solution:**

1. **Identify the Outer Planets**: The outer planets in our solar system are Jupiter, Saturn, Uranus, and Neptune. These planets are located beyond the asteroid belt and are often referred to as gas giants.

2. **Composition of Outer Planets**: The primary composition of these outer planets is gases. They are predominantly made up of hydrogen and helium, which are the two lightest and most abundant elements in the universe.

3. **Understanding Gas Giants**: Unlike the inner planets (Mercury, Venus, Earth, and Mars), which are rocky and terrestrial, the outer planets are classified as gas giants. This means they do not have a solid surface like the inner planets.

4. **Additional Elements**: In addition to hydrogen and helium, the outer planets may also contain other gases such as methane, ammonia, and water vapor. These gases contribute to the unique atmospheric conditions and colors of each planet.

5. **Conclusion**: Therefore, the outer planets are primarily composed of gases, with hydrogen and helium being the most significant components.

**Final Answer**: The outer planets (Jupiter, Saturn, Uranus, and Neptune) are composed mainly of gases, primarily hydrogen and helium.

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