................ is surrounded in a ring system that extend thousands of kilometer into space.

Options

A. Mars
B. Saturn
C. Sun
D. Moon

Explanation

**Step-by-Step Solution:**

1. **Identify the Subject of the Question**: The question asks for a celestial body that is surrounded by a ring system extending thousands of kilometers into space.

2. **Recall Knowledge of Planets**: Among the planets in our solar system, recall which ones are known for having ring systems. The most notable planet with a prominent ring system is Saturn.

3. **Confirm the Characteristics of Saturn**: Saturn is well-known for its extensive and beautiful rings. Research or recall that these rings are made up of ice, dust, and particles.

4. **Historical Context**: Note that the rings of Saturn were discovered by Galileo in 1610, which emphasizes the significance of Saturn in astronomical history.

5. **Conclusion**: Based on the information gathered, conclude that the answer to the question is "Saturn".

**Final Answer**: Saturn is surrounded in a ring system that extends thousands of kilometers into space.

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