The Solar System - Worksheets | PDF | Planets | Solar System - Free Printable

Let's solve this step-by-step based on the image you've provided. This is a worksheet about "The Solar System" and the universe, with fill-in-the-blank definitions and image labeling.

---

✔ Part 1: Complete the Definitions

#### a) The universe is an ____________ open space that contains ____________ and all the ____________ bodies. There are ____________ of galaxies in the universe. The universe is constantly ____________.

Answer:
> The universe is an infinite open space that contains stars and all the celestial bodies. There are billions of galaxies in the universe. The universe is constantly expanding.

✔ Explanation:
- The universe is often described as infinite or vast, containing stars, planets, galaxies, etc.
- "Celestial bodies" refers to objects in space (planets, moons, stars, etc.).
- There are billions of galaxies in the observable universe.
- The universe is expanding due to the Big Bang theory.

---

#### b) A galaxy is a group of ____________, ____________, ____________ and ____________ that orbits a ____________. There are billions of ____________ in one galaxy. Scientists who study galaxies are called ____________.

Answer:
> A galaxy is a group of stars, planets, dust, and gas that orbits a center of mass (or central point). There are billions of stars in one galaxy. Scientists who study galaxies are called astronomers.

✔ Explanation:
- Galaxies contain stars, planets, gas, dust, and dark matter, all bound by gravity and orbiting around a central region (often a supermassive black hole).
- Each galaxy has billions of stars.
- Astronomers study celestial objects and phenomena, including galaxies.

---

#### c) Our galaxy is called the ____________. It contains billions of ____________. The most important star for us is the ____________. We can see the Milky Way from the ____________.

Answer:
> Our galaxy is called the Milky Way. It contains billions of stars. The most important star for us is the Sun. We can see the Milky Way from the Earth.

✔ Explanation:
- The Milky Way is our home galaxy.
- It has over 100 billion stars.
- The Sun is the star at the center of our solar system and essential for life on Earth.
- From Earth, especially in dark areas, we can see the Milky Way as a band of light across the night sky.

---

✔ Part 2: Write the names

Now, match the images below with the correct labels:

We are given a word bank:
> Planet – The Milky Way – Solar System – The Sun – Stars – a galaxy

Let’s analyze each image:

1. First image (top left): Shows the Sun with planets orbiting it → Solar System
2. Second image (top middle): Shows many bright dots (stars) in space → Stars
3. Third image (top right): Spiral-shaped galaxy → The Milky Way or a galaxy
4. Fourth image (bottom left): Spiral galaxy (similar to Milky Way) → a galaxy or The Milky Way
5. Fifth image (bottom middle): Bright orange sphere with surface features → The Sun
6. Sixth image (bottom right): Planet with rings → Planet (specifically Saturn)

But note: The word bank says:
> Planet – The Milky Way – Solar System – The Sun – Stars – a galaxy

So we have six items to label.

Let’s assign:

1. Image 1: Solar System
2. Image 2: Stars
3. Image 3: The Milky Way
4. Image 4: a galaxy *(if not Milky Way, then generic)*
But wait — Image 3 and Image 4 both show spiral galaxies. Since one is labeled “The Milky Way,” the other could be “a galaxy” (generic).

But since only one is "The Milky Way," and the other spiral is similar but not necessarily ours, we should use:

- Image 3 (top right): The Milky Way
- Image 4 (bottom left): a galaxy

Alternatively, if both are Milky Way-like, perhaps the intended answer is:

- Image 3: The Milky Way
- Image 4: a galaxy

But since the question asks to write the names, and the options include "The Milky Way" and "a galaxy", we can distinguish them.

Also, Image 6 clearly shows Saturn, which is a Planet.

Final assignment:

| Image | Label |
|-------|-------|
| 1 (Sun + planets) | Solar System |
| 2 (cluster of stars) | Stars |
| 3 (spiral galaxy, top right) | The Milky Way |
| 4 (spiral galaxy, bottom left) | a galaxy |
| 5 (bright sun) | The Sun |
| 6 (ringed planet) | Planet |

✔ So the answers under the images are:

1. Solar System
2. Stars
3. The Milky Way
4. a galaxy
5. The Sun
6. Planet

---

✔ Final Answer Summary

#### Definitions:

a) The universe is an infinite open space that contains stars and all the celestial bodies. There are billions of galaxies in the universe. The universe is constantly expanding.

b) A galaxy is a group of stars, planets, dust, and gas that orbits a center of mass. There are billions of stars in one galaxy. Scientists who study galaxies are called astronomers.

c) Our galaxy is called the Milky Way. It contains billions of stars. The most important star for us is the Sun. We can see the Milky Way from the Earth.

#### Images (from left to right, top to bottom):

1. Solar System
2. Stars
3. The Milky Way
4. a galaxy
5. The Sun
6. Planet

---

This completes the worksheet! Let me know if you'd like a printable version or want to add more details.