Model 1 - Orbits of the Eight Planets in Our Solar System

Let’s work through the questions one by one using Model 1.

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Question 2: Look closely at Model 1. Which planet’s orbit is closest to the sun? Which planet’s orbit is farthest from the sun?

Looking at the diagram:

- The Sun is in the center.
- The innermost orbit (closest to the Sun) is labeled “Mercury”.
- The outermost orbit (farthest from the Sun) is labeled “Neptune”.

So:
→ Closest to the Sun: Mercury
→ Farthest from the Sun: Neptune

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Question 3: Write the names of the inner planets in order: Closest to the sun → Farthest from the sun

From the diagram, the inner planets are shown in the “Expanded view of the inner planet orbits” section. They are labeled as:

- Mercury (innermost)
- Venus
- Earth
- Mars (outermost of the inner planets)

So the correct order from closest to farthest from the Sun is:

Mercury → Venus → Earth → Mars

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Final Answer:
2. Closest to the sun: Mercury; Farthest from the sun: Neptune
3. Inner planets in order: Mercury, Venus, Earth, Mars