Which of planets is known as "outer planets'?

Options

A. Mercury, Venus, Earth and Mars
B. Mercury, Venus, Jupiter and Neptune
C. Neptune, Venus, Mercury and Mars
D. Jupiter, Saturn, Uranus, Neptune

Explanation

**Step-by-Step Solution:**

1. **Understanding the Solar System:** The solar system consists of various celestial bodies, including the Sun, planets, moons, asteroids, and comets. The planets are categorized into two groups: inner planets and outer planets.

2. **Identifying Inner and Outer Planets:** The inner planets are those that are closer to the Sun, which include Mercury, Venus, Earth, and Mars. These planets are terrestrial, meaning they have solid surfaces.

3. **Recognizing the Asteroid Belt:** Between the inner planets (Mars) and the outer planets (Jupiter), there is an asteroid belt. This belt acts as a boundary that separates the inner planets from the outer planets.

4. **Listing the Outer Planets:** The outer planets are those that are located beyond the asteroid belt. They include:
- Jupiter
- Saturn
- Uranus
- Neptune

5. **Conclusion:** Therefore, the planets known as the "outer planets" are Jupiter, Saturn, Uranus, and Neptune.

**Final Answer:** The outer planets are Jupiter, Saturn, Uranus, and Neptune.

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