vocabulary review
name ____________
use the terms in the box to complete the sentences.
1. together, a star and all the planets and other objects orbiting it form a(n) ________.
2. a chunk of rock or iron that orbits the sun is called a(n) ________.
3. a huge ball of very hot, glowing gases in space that can produce its own heat and light is called a(n) ________.
4. a group of solar systems that are held together by gravity and classified by shape is called a(n) ________.
5. the picture shows an example of a(n) ________. image of a comet

science concepts
fill in the letter of the choice that best answers the question.
6. scientists use models to represent or explain things in the natural world. why are models useful for the study of the solar system?
a because models cannot be proven wrong
b because models are always accepted by all scientists
c because models describe the way things actually are
d because models can be used to describe how things work
7. the illustration below shows several planets orbiting a star. image of solar system
what type of group is the figure illustrating?
f constellation
g solar system
h galaxy system
i universe

Question

vocabulary review
name ____________
use the terms in the box to complete the sentences.
1. together, a star and all the planets and other objects orbiting it form a(n) ________.
2. a chunk of rock or iron that orbits the sun is called a(n) ________.
3. a huge ball of very hot, glowing gases in space that can produce its own heat and light is called a(n) ________.
4. a group of solar systems that are held together by gravity and classified by shape is called a(n) ________.
5. the picture shows an example of a(n) ________. image of a comet

science concepts
fill in the letter of the choice that best answers the question.
6. scientists use models to represent or explain things in the natural world. why are models useful for the study of the solar system?
   a because models cannot be proven wrong
   b because models are always accepted by all scientists
   c because models describe the way things actually are
   d because models can be used to describe how things work
7. the illustration below shows several planets orbiting a star. image of solar system
   what type of group is the figure illustrating?
   f constellation
   g solar system
   h galaxy system
   i universe

Accepted Answer

### Vocabulary Review
1. **Explanation**: A solar system consists of a star and the objects orbiting it.
    - Answer: solar system
2. **Explanation**: An asteroid is a chunk of rock or iron orbiting the sun.
    - Answer: asteroid
3. **Explanation**: A star is a huge ball of hot, glowing gases producing heat and light.
    - Answer: star
4. **Explanation**: A galaxy is a group of solar systems held by gravity, classified by shape.
    - Answer: galaxy
5. **Explanation**: The picture (comet - like) shows a comet.
    - Answer: comet

### Science Concepts
6. **Explanation**:
    - Option A: Models can be proven wrong, so A is incorrect.
    - Option B: Models aren't always accepted by all scientists, B is wrong.
    - Option C: Models are representations, not exact descriptions of how things are, C is incorrect.
    - Option D: Models are useful as they describe how things work, D is correct.
    - Answer: D
7. **Explanation**: The illustration shows planets orbiting a star, which is a solar system. Constellations are groups of stars, galaxy systems are groups of solar systems, and the universe is all of space. So the answer is G.
    - Answer: G (solar system)

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Science Concepts

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