Educational worksheet on the solar system and universe, featuring fill-in-the-blank questions and images of celestial bodies.

Task: Complete the definitions and write the names of the objects in the images.

#### 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 ____________.

- The universe is an immense open space that contains matter, energy, 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 ____________, ____________, ____________, and ____________ that orbits a ____________. There are billions of ____________ in one galaxy. Scientists who study galaxies are called ____________.

- 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 astrophysicists.

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 ____________.

- 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.

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#### Write the names:

1. First Image (Planetary System):
- This image shows a planetary system with multiple planets orbiting a central star. The name is: Solar System.

2. Second Image (Stars):
- This image shows a cluster of stars in space. The name is: Stars.

3. Third Image (Galaxy):
- This image shows a spiral galaxy, which is a type of galaxy structure. The name is: Galaxy.

4. Fourth Image (Spiral Galaxy):
- This image shows a spiral galaxy with distinct arms. The name is: Spiral Galaxy.

5. Fifth Image (Star):
- This image shows a bright, glowing star. The name is: Sun.

6. Sixth Image (Planet):
- This image shows a planet with rings, which is Saturn. The name is: Saturn.

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Final Answers:

#### Definitions:
- a) immense, matter, energy, celestial, billions, expanding
- b) stars, planets, dust, gas, center of mass, stars, astrophysicists
- c) Milky Way, stars, Sun, Earth

#### Names:
1. Solar System
2. Stars
3. Galaxy
4. Spiral Galaxy
5. Sun
6. Saturn

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Explanation:

1. Definitions:
- The universe is vast and contains everything we know, including galaxies, stars, planets, and other celestial bodies. It is constantly expanding due to the Big Bang theory.
- A galaxy is a massive collection of stars, planets, dust, and gas held together by gravity. Scientists who study galaxies are called astrophysicists.
- Our galaxy, the Milky Way, is home to billions of stars, including our Sun. We can observe parts of the Milky Way from Earth as a band of light across the night sky.

2. Images:
- The first image depicts the Solar System, which includes the Sun and its orbiting planets.
- The second image shows stars, which are luminous balls of gas that emit light and heat.
- The third image is a representation of a galaxy, which is a large collection of stars, gas, and dust.
- The fourth image shows a spiral galaxy, characterized by its spiral arms.
- The fifth image is the Sun, the central star of our Solar System.
- The sixth image is Saturn, one of the planets in our Solar System, known for its prominent ring system.

This completes the task! 😊