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

Here is the completed worksheet with correct answers and explanations:

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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 planets from the Sun is: Mercury (1st), Venus (2nd), Earth (3rd), Mars (4th), Jupiter (5th), Saturn (6th), Uranus (7th), Neptune (8th).

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

→ orbits

✔ *Explanation:* Planets revolve around the Sun in elliptical paths called “orbits.”

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

→ Mercury

✔ *Explanation:* Mercury is the smallest planet by both diameter and mass. (Note: Pluto is no longer classified as a planet.)

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4. What is the nearest planet to the Sun?

→ Mercury

✔ *Explanation:* Mercury is closest to the Sun — about 57.9 million km away on average.

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

→ Venus

✔ *Explanation:* Although Mercury is closer to the Sun, Venus is hotter due to its thick atmosphere of carbon dioxide, which traps heat (runaway greenhouse effect). Surface temperatures reach ~465°C (869°F).

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

→ Earth

✔ *Explanation:* From the Sun: 1st = Mercury, 2nd = Venus, 3rd = Earth.

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7. True or False.

- Nearly the 50% of the Earth’s surface is covered with water. → False
✔ *Explanation:* About 71% of Earth’s surface is covered by water — mostly oceans.

- The Earth is also called the blue planet. → True
✔ *Explanation:* From space, Earth appears blue due to its vast oceans — hence the nickname “Blue Planet.”

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

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

- Jupiter is the smallest planet in our Solar System. → False
✔ *Explanation:* Jupiter is actually the largest planet. Mercury is the smallest.

- Saturn is the 1st planet in our Solar System. → False
✔ *Explanation:* Mercury is the 1st; Saturn is the 6th.

- Saturn has rings around it that are made of ice and dust. → True
✔ *Explanation:* Saturn’s rings are composed mostly of ice particles, with some rock and dust.

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

→ Mars

✔ *Explanation:* Order: 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?

→ Jupiter *(or any of the gas giants: Jupiter, Saturn, Uranus, Neptune)*

✔ *Explanation:* The four outer planets — Jupiter, Saturn, Uranus, and Neptune — are called “gas giants” because they are mostly made of hydrogen and helium gases. Jupiter is the largest and most commonly referenced.

*(If you must pick one, Jupiter is the best answer.)*

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

→ Neptune

✔ *Explanation:* From the Sun: 8th and farthest known planet is 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 *(or gas giant)*
10. Neptune

Let me know if you’d like this formatted as a printable answer sheet! 🌍🚀