What do all four gas giants have that terrestrial planets do not have?

Options

A. atmosphere
B. solid surfaces
C. moons
D. rings

Answer

To answer the question, "What do all four gas giants have that terrestrial planets do not have?", we can analyze the characteristics of both gas giants and terrestrial planets step by step.

### Step 1: Identify the Gas Giants
The four gas giants in our solar system are:
- Jupiter
- Saturn
- Uranus
- Neptune

### Step 2: Identify the Terrestrial Planets
The terrestrial planets, which are smaller and closer to the Sun, include:
- Mercury
- Venus
- Earth
- Mars

### Step 3: Compare Key Characteristics
Now, let's compare the characteristics of gas giants and terrestrial planets:

1. **Atmosphere**:
- Gas giants have thick atmospheres composed mainly of hydrogen and helium.
- Terrestrial planets also have atmospheres, but they are much thinner (e.g., Earth has a significant atmosphere, while Mercury has a very thin one).

2. **Solid Surfaces**:
- Gas giants do not have solid surfaces in the same way terrestrial planets do; they are mostly composed of gases and liquids.
- Terrestrial planets have solid rocky surfaces.

3. **Moons**:
- Gas giants have many moons (e.g., Jupiter has over 79 known moons).
- Terrestrial planets also have moons (e.g., Earth has 1 moon, Mars has 2), so this is not a distinguishing feature.

4. **Rings**:
- All four gas giants have ring systems, although Saturn's rings are the most prominent.
- Terrestrial planets do not have any ring systems.

### Conclusion
Based on the comparison, the unique feature that all four gas giants have, which terrestrial planets do not have, is **rings**.

### Final Answer
All four gas giants have **rings**, which terrestrial planets do not have.

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