A celestial body that revolves around a star is

Options

A. (a) Planet
B. (b) Satellite
C. (c) Asteroid
D. (d) Comet.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a term that describes a celestial body that revolves around a star.

2. **Identifying Celestial Bodies**: In our solar system, we have various celestial bodies, including planets, moons, asteroids, and comets. However, the focus here is on those that revolve around a star.

3. **Recognizing the Star**: In our solar system, the star we revolve around is the Sun. The Sun is classified as a star because it emits light and heat due to nuclear fusion occurring in its core.

4. **Defining Revolution**: The term "revolution" refers to the movement of a celestial body in an orbit around a star. For example, Earth takes approximately 365 days to complete one revolution around the Sun.

5. **Identifying the Correct Term**: The celestial bodies that revolve around the Sun (our star) are known as planets. The term "planet" comes from the Greek word meaning "wanderer," which is fitting since these bodies move in orbits around the Sun.

6. **Eliminating Incorrect Options**: While there are other celestial bodies in space, such as asteroids and comets, they do not fit the definition of a celestial body that primarily revolves around a star in the same way that planets do.

7. **Conclusion**: Therefore, the correct answer to the question is "a planet."

**Final Answer**: A celestial body that revolves around a star is called a **planet**.

---