Educational worksheet on the formation of the solar system, designed for students to learn about the sequence of events from a nebula to the formation of planets and the sun.

Let's solve this step-by-step. The task is to number the sentences from 1 to 15 in chronological order (i.e., the correct sequence of events in the formation of the Solar System), and then fill in the blanks using the words provided in the box.

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Step 1: Understand the Words Available

The word bank includes:
- gravity
- Jupiter
- meteorites
- moons
- particles
- planets
- solar
- rocky
- nebula
- stellar
- wind
- Sun
- supernova

We’ll use these to fill in the blanks.

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Step 2: Identify the Correct Chronological Order

We need to reconstruct the formation of the Solar System, starting from the beginning:

1. A cloud of dust and gas exists → "Our solar system began as a cloud of dust and gas."
2. An event disturbs the cloud → A nearby supernova explodes, sending shockwaves.
3. The cloud collapses due to gravity.
4. The cloud begins spinning (conservation of angular momentum).
5. Gas and dust stick together → forming particles.
6. Gravity pulls material together → forming larger clumps.
7. Center heats up → becomes the Sun.
8. Disk forms around the center (solar nebula).
9. Only rocky material survives near the center (too hot for ice).
10. Icy matter and rock settle on the outside → form planets like Jupiter.
11. Some groups grow into planets → planets and moons.
12. Leftover material → meteorites.
13. Stellar wind blows away remaining gas and dust.
14. Disk gets thinner as it spins.
15. Resulting structure: solar nebula with the Sun at the center.

Now let’s go sentence by sentence and number them correctly.

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Final Answer with Numbered Sentences and Blanks Filled

We'll number each sentence in the correct order and fill in the blanks.

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1. Our solar system began as a cloud of dust and gas.

2. An exploding star, called a supernova, disturbed the cloud.

3. The explosion made waves that squeezed the cloud.

4. The cloud began to collapse.

5. The gravity pulled the gas and dust together.

6. The cloud of dust and gas began to stick together.

7. The solar nebula became hot and dense in the center. The surrounding disk of gas and dust that was cooler at the edges.

8. Near the center only rocky material could stand the heat.

9. Icy matter and rock settled on the outside of the disk where it was cooler. Planets such as Jupiter formed from this.

10. Some groups of particles grew bigger and bigger. These later became planets and moons.

11. The center got so hot it became a star we call the Sun.

12. The solar nebula began spinning.

13. The disk grew thinner as the solar nebula continued spinning.

14. Stellar wind blew gas and dust around the solar system. This leftover gas and dust is now called meteorites.

15. This turned the cloud into what is called a nebula.

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Wait — there's an issue here. Sentence 15 says “This turned the cloud into what is called a ______.” But the cloud *was* already a nebula. Let's double-check.

Actually, "the cloud" refers to the solar nebula. So the process transforms the original cloud into the solar nebula.

But the sentence says:
> "This turned the cloud into what is called a ______."

So “this” refers to the collapse and spinning. That process turns the cloud into a solar nebula.

So the blank should be solar nebula.

But wait — “solar nebula” is two words. Is “solar” and “nebula” both used?

Yes! We have both in the word bank.

So:
This turned the cloud into what is called a solar nebula.

But the sentence says:
> "This turned the cloud into what is called a ______."

We can't write two words unless allowed. But looking back: the blank is one line. So likely, we are to use nebula, but the full term is solar nebula.

But perhaps the intended answer is nebula, and “solar” is used elsewhere.

Wait — look at sentence 7:
> "The solar nebula became hot and dense..." — so solar nebula is a term.

But in sentence 15, it says:
> "This turned the cloud into what is called a ______."

That implies the name of the structure — solar nebula.

But since the blank is one, maybe it's just nebula, and “solar” is used earlier.

Alternatively, perhaps the sentence is meant to say:
> "This turned the cloud into what is called a solar nebula."

But the blank is single.

Looking at the format, likely the word nebula is sufficient, and “solar” is used in other places.

But in sentence 7, it says: “The solar nebula became...”, so “solar nebula” is the full term.

So probably, sentence 15 should be filled with nebula, and “solar” is used in sentence 7.

But sentence 15 says: “This turned the cloud into what is called a ______.”

So the answer is nebula — the cloud became a nebula.

But it's specifically the solar nebula.

However, since “solar” is a separate word, and we must use the words from the box, and the blank is one, we can only use nebula.

But let’s check the sentence again:
> "This turned the cloud into what is called a ______."

And earlier:
> "The solar nebula began spinning."

So “solar nebula” is a compound noun.

But in the word bank, “solar” and “nebula” are separate.

So likely, the sentence is expecting nebula, and “solar” is used in another sentence.

Wait — actually, sentence 12 says:
> "The solar nebula began spinning."

So “solar nebula” is already used.

Therefore, sentence 15:
> "This turned the cloud into what is called a nebula."

But that’s not quite accurate — it's a solar nebula.

Perhaps the intended answer is solar nebula, but since it's one blank, maybe it's just nebula.

Alternatively, maybe the sentence is:
> "This turned the cloud into what is called a solar nebula." — but we have to pick one word.

Wait — no, the blank is one line. So likely, the intended answer is nebula, and “solar” is used in sentence 7.

But let’s re-express all sentences with numbers.

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Correct Chronological Order (1–15)

Let’s list the sentences in order and fill the blanks.

1. Our solar system began as a cloud of dust and gas.
→ No blank.

2. An exploding star, called a supernova, disturbed the cloud.
→ Blank: supernova

3. The explosion made waves that squeezed the cloud.
→ No blank.

4. The cloud began to collapse.
→ No blank.

5. A powerful force called gravity pulled the gas and dust together.
→ Blank: gravity

6. The cloud of dust and gas began to stick together.
→ Blank: cloud? Wait — no, the sentence says: "The cloud of dust and gas began to stick together." So it's referring to particles forming.

Actually, the sentence is:
> "The ____ of dust and gas began to stick together."

So the blank is cloud.

But "cloud" isn't in the word bank? Wait — let's check:

Word bank:
gravity, Jupiter, meteorites, moons, particles, planets, solar, rocky, nebula, stellar, wind, Sun, supernova

"Cloud" is not in the list. But "nebula" is.

Oh! So likely, the sentence is:
> "The nebula of dust and gas began to stick together."

But "nebula" is used earlier.

Alternatively, perhaps it's "particles".

Wait — the sentence is:
> "The ____ of dust and gas began to stick together."

So the subject is missing. But “particles” would make sense:
> "The particles of dust and gas began to stick together."

Yes — that makes sense.

So blank = particles

And "particles" is in the word bank.

So sentence 6:
> "The particles of dust and gas began to stick together."

7. The solar nebula became hot and dense in the center. The surrounding disk of gas and dust that was cooler at the edges.
→ This is awkward. Probably means:
> "The solar nebula became hot and dense in the center. The surrounding disk of gas and dust was cooler at the edges."

But no blank.

8. Near the center only rocky material could stand the heat.
→ Blank: rocky

9. Icy matter and rock settled on the outside of the disk where it was cooler. Planets such as Jupiter formed from this.
→ Blank: Jupiter

10. Some groups of particles grew bigger and bigger. These later became planets and moons.
→ Blanks: planets and moons

11. The center got so hot it became a star we call the Sun.
→ Blank: Sun

12. The solar nebula began spinning.
→ No blank.

13. The disk grew thinner as the solar nebula continued spinning.
→ No blank.

14. Stellar wind blew gas and dust around the solar system. This leftover gas and dust is now called meteorites.
→ Blanks: stellar, wind, and meteorites

15. This turned the cloud into what is called a nebula.
→ Blank: nebula

But wait — sentence 15:
> "This turned the cloud into what is called a ______."

What does "this" refer to? The collapse and spinning — which created the solar nebula.

So the answer is nebula.

But “solar” is already used in “solar nebula” in sentence 12.

So yes, nebula is correct.

Now let’s assign numbers.

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Final Answer with Numbers and Blanks Filled

We now reorder the sentences in chronological order.

Let’s list them in the correct sequence:

1. Our solar system began as a cloud of dust and gas.
2. An exploding star, called a supernova, disturbed the cloud.
3. The explosion made waves that squeezed the cloud.
4. The cloud began to collapse.
5. A powerful force called gravity pulled the gas and dust together.
6. The particles of dust and gas began to stick together.
7. The solar nebula became hot and dense in the center. The surrounding disk of gas and dust that was cooler at the edges.
8. Near the center only rocky material could stand the heat.
9. Icy matter and rock settled on the outside of the disk where it was cooler. Planets such as Jupiter formed from this.
10. Some groups of particles grew bigger and bigger. These later became planets and moons.
11. The center got so hot it became a star we call the Sun.
12. The solar nebula began spinning.
13. The disk grew thinner as the solar nebula continued spinning.
14. Stellar wind blew gas and dust around the solar system. This leftover gas and dust is now called meteorites.
15. This turned the cloud into what is called a nebula.

Wait — but sentence 15 says "this turned the cloud into what is called a nebula" — but the cloud already existed. The process transformed it into a solar nebula, so "nebula" is acceptable.

But note: sentence 7 mentions "the solar nebula", so it's already named.

So the last sentence might be redundant.

But in terms of logic, after collapse and spinning, you get a nebula — so it's fine.

Now, let’s number the original sentences as they appear in the worksheet.

But the user wants us to number the sentences from 1 to 15 in chronological order.

So we need to reorder the given sentences.

Let’s list the original sentences (as per the image):

Original list (unnumbered):

A. ___ Icy matter and rock settled on the outside of the disk where it was cooler. Planets such as _____ formed from this.

B. ___ The disk grew thinner as the solar nebula continued spinning.

C. ___ The solar nebula began spinning.

D. ___ The explosion made waves that squeezed the cloud.

E. ___ The center got so hot it became a star we call the _________.

F. ___ A powerful force called ________ pulled the gas and dust together.

G. ___ Some groups of particles grew bigger and bigger. These later became ________ and ________.

H. ___ Our solar system began as a cloud of dust and gas.

I. ___ ________ blew gas and dust around the solar system. This leftover gas and dust is now called __________.

J. ___ An exploding star, called a ________, disturbed the cloud.

K. ___ The ________ of dust and gas began to stick together.

L. ___ The cloud began to collapse.

M. ___ Near the center only ________ material could stand the heat.

N. ___ This turned the cloud into what is called a __________.

O. ___ The solar nebula became hot and dense in the center. The surrounding disk of gas and dust that was cooler at the edges.

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Now, we number them in order:

1. H. Our solar system began as a cloud of dust and gas.

2. J. An exploding star, called a supernova, disturbed the cloud.

3. D. The explosion made waves that squeezed the cloud.

4. L. The cloud began to collapse.

5. F. A powerful force called gravity pulled the gas and dust together.

6. K. The particles of dust and gas began to stick together.

7. O. The solar nebula became hot and dense in the center. The surrounding disk of gas and dust that was cooler at the edges.

8. M. Near the center only rocky material could stand the heat.

9. A. Icy matter and rock settled on the outside of the disk where it was cooler. Planets such as Jupiter formed from this.

10. G. Some groups of particles grew bigger and bigger. These later became planets and moons.

11. E. The center got so hot it became a star we call the Sun.

12. C. The solar nebula began spinning.

13. B. The disk grew thinner as the solar nebula continued spinning.

14. I. Stellar wind blew gas and dust around the solar system. This leftover gas and dust is now called meteorites.

15. N. This turned the cloud into what is called a nebula.

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✔ Final Answer:

Now, write the numbered sentences with blanks filled:

1. Our solar system began as a cloud of dust and gas.

2. An exploding star, called a supernova, disturbed the cloud.

3. The explosion made waves that squeezed the cloud.

4. The cloud began to collapse.

5. A powerful force called gravity pulled the gas and dust together.

6. The particles of dust and gas began to stick together.

7. The solar nebula became hot and dense in the center. The surrounding disk of gas and dust that was cooler at the edges.

8. Near the center only rocky material could stand the heat.

9. Icy matter and rock settled on the outside of the disk where it was cooler. Planets such as Jupiter formed from this.

10. Some groups of particles grew bigger and bigger. These later became planets and moons.

11. The center got so hot it became a star we call the Sun.

12. The solar nebula began spinning.

13. The disk grew thinner as the solar nebula continued spinning.

14. Stellar wind blew gas and dust around the solar system. This leftover gas and dust is now called meteorites.

15. This turned the cloud into what is called a nebula.

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✔ Explanation:

This sequence follows the scientific model of solar system formation:

1. Supernova triggers collapse of a nebula.
2. Gravity pulls material together.
3. Particles accrete into larger bodies.
4. Rocky planets form near the hot center; icy planets form farther out.
5. The Sun ignites at the center.
6. Stellar wind clears out remaining gas.
7. Leftover debris becomes meteorites.

All words from the box are used appropriately.

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✔ Answer Completed.