Educational worksheet on the planets of the solar system with fill-in-the-blank questions and true/false statements.

Here is the complete solution to the worksheet “Planets of the Solar System,” with clear explanations for each answer.

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1. Complete the order of the planets from the Sun:

Mercury, Venus Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

✔ Explanation: The correct order of the 8 planets from closest to farthest from the Sun is:
- Mercury
- Venus
- Earth
- Mars
- Jupiter
- Saturn
- Uranus
- Neptune

*(Note: Pluto is no longer classified as a planet by the International Astronomical Union.)*

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2. The planets go around the Sun in define ________ .

✔ Answer: orbits

✔ Explanation: Planets revolve around the Sun in elliptical paths called “orbits.” This motion is governed by gravity.

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3. What is the smallest planet in the Solar System?

✔ Answer: Mercury

✔ Explanation: Mercury has the smallest diameter (about 4,880 km) and mass among the eight planets. Although it was once thought Pluto was smaller, Pluto is now classified as a dwarf planet.

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4. What is the nearest planet to the Sun?

✔ Answer: Mercury

✔ Explanation: Mercury is the closest planet to the Sun, orbiting at an average distance of about 57.9 million kilometers.

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5. What is the hottest planet in the Solar System?

✔ Answer: Venus

✔ Explanation: Although Mercury is closer to the Sun, Venus is hotter due to its thick atmosphere rich in carbon dioxide, which creates a runaway greenhouse effect. Surface temperatures on Venus can reach up to 471°C (880°F).

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6. What is the 3rd planet in our Solar System?

✔ Answer: Earth

✔ Explanation: Counting from the Sun:
1. Mercury
2. Venus
3. Earth

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7. True or False.

Let’s evaluate each statement:

- Nearly the 50% of the Earth’s surface is covered with water.
✘ False — Actually, about 71% of Earth’s surface is covered by water (oceans, seas, lakes, etc.).

- The Earth is also called the blue planet.
✔ True — Because from space, Earth appears blue due to its vast oceans.

- The Earth is the only planet on which known life exist.
✔ True — As of now, Earth is the only planet confirmed to support life.

- Mars is also called the red planet.
✔ True — Mars appears reddish due to iron oxide (rust) on its surface.

- Jupiter is the smallest planet in our Solar System.
✘ False — Jupiter is actually the largest planet.

- Saturn is the 1st planet in our Solar System.
✘ False — Saturn is the 6th planet from the Sun.

- Saturn has rings around it that are made of ice and dust.
✔ True — Saturn’s rings are composed mostly of ice particles, with some rock and dust mixed in.

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8. What is the name of the 4th planet?

✔ Answer: Mars

✔ Explanation: Order from the Sun:
1. Mercury
2. Venus
3. Earth
4. Mars

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9. What is the name of the planet with a thick layer of gas?

✔ Answer: Jupiter *(or any of the gas giants: Jupiter, Saturn, Uranus, Neptune)*
But since the question says “the planet,” and Jupiter is the largest and most iconic gas giant, Jupiter is the best single answer.

✔ Explanation: Jupiter is a gas giant composed mostly of hydrogen and helium, with no solid surface. It has a very thick gaseous atmosphere.

*(Note: Saturn, Uranus, and Neptune are also gas/ice giants, but Jupiter is the most commonly referenced for this description.)*

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10. What is the name of the 8th planet?

✔ Answer: Neptune

✔ Explanation: Counting from the Sun:
1. Mercury
2. Venus
3. Earth
4. Mars
5. Jupiter
6. Saturn
7. Uranus
8. Neptune

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✔ Final Answer Summary:

1. Earth, Jupiter, Neptune
2. orbits
3. Mercury
4. Mercury
5. Venus
6. Earth
7.
- False
- True
- True
- True
- False
- False
- True
8. Mars
9. Jupiter
10. Neptune

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