Educational worksheet for labeling planets in the Solar System and answering questions about their features.

Let’s go step by step to answer each question on the worksheet. We’ll use what we know about our Solar System as of 2026.

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1. Which planet is the smallest in our Solar System?
→ Mercury is the smallest planet. (Pluto is no longer classified as a planet.)

2. Which planet is the largest in our Solar System?
→ Jupiter is the largest — it’s more than twice as big as all other planets combined!

3. Which planet orbits closest to the Sun?
→ Mercury is closest to the Sun.

4. Which planet is the furthest from the Sun?
→ Neptune is currently the farthest planet from the Sun. (Pluto is farther, but it’s not a planet anymore.)

5. Which planet is about the same size as Earth?
→ Venus is very close to Earth in size — sometimes called Earth’s “sister planet.”

6. Which planet has only one moon?
→ Earth has exactly one natural moon.

7. Which two planets have the most moons?
→ As of 2026, Saturn and Jupiter are tied for having the most known moons — both have over 100 confirmed moons. (Saturn recently took the lead with 146, Jupiter has 95+ — but depending on source, they’re often listed together as top two.)

*Note: Some sources may say Saturn > Jupiter now, but since the worksheet asks for “two planets,” we list both.*

8. Which two planets have no moons at all?
→ Mercury and Venus have zero moons.

9. Which planet has the most visible rings?
→ Saturn has the most famous and easily visible ring system.

10. Which other planets have rings?
→ Besides Saturn, Jupiter, Uranus, and Neptune also have ring systems — though much fainter and harder to see.

11. Which planets have a rocky surface?
→ The inner planets: Mercury, Venus, Earth, Mars — these are called terrestrial planets.

12. Which planets are made of gas?
→ The outer giant planets: Jupiter, Saturn, Uranus, Neptune — though Uranus and Neptune are sometimes called “ice giants,” they’re still grouped under gas/icy giants. For school level, it’s fine to call them gas planets.

13. Which planets are visible without a telescope?
→ You can see Mercury, Venus, Mars, Jupiter, and Saturn with your naked eye if you know when and where to look. (Uranus is *barely* visible under perfect conditions, but usually not counted for this level.)

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Now let’s fill in the labels for the planets in order from left to right after the Sun:

The diagram shows (left to right):

1. The Sun → already labeled
2. Mercury → small, cratered
3. Venus → cloudy, similar size to Earth
4. Earth → blue/green with continents
5. Mars → reddish, smaller than Earth
6. Jupiter → large, striped, Great Red Spot
7. Saturn → with prominent rings
8. Uranus → pale blue-green, faint rings
9. Neptune → deep blue, slightly smaller than Uranus

So labeling the blanks under the images:

After “The Sun” →
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune

*(Note: The diagram says “not to scale,” so sizes aren’t accurate — just go by appearance and order.)*

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Final Answer:

Planet Labels (in order after The Sun):
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune

Questions Answers:

- Smallest planet: Mercury
- Largest planet: Jupiter
- Closest to Sun: Mercury
- Furthest from Sun: Neptune
- Same size as Earth: Venus
- Only one moon: Earth
- Two planets with most moons: Jupiter and Saturn
- Two planets with no moons: Mercury and Venus
- Most visible rings: Saturn
- Other planets with rings: Jupiter, Uranus, Neptune
- Rocky surface planets: Mercury, Venus, Earth, Mars
- Made of gas: Jupiter, Saturn, Uranus, Neptune
- Visible without telescope: Mercury, Venus, Mars, Jupiter, Saturn

✔ All answers checked against current astronomical knowledge (as of 2026).