Galaxy: Definition & Explanation


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question 1 of 3

Which of the following is not a type of galaxy?

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1. How large in diameter can galaxies get?

2. Who created a classification system for galaxies?

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About This Quiz & Worksheet

Use this quiz/worksheet combo to test your understanding of the characteristics of galaxies. Topics of specific interest include the number of galaxies in the known universe and the way galaxies are classified.

Quiz & Worksheet Goals

In these assessments you'll be tested on:

  • Types and sizes of galaxies
  • Galaxy composition and classification
  • Estimated number of galaxies in the known universe

Skills Practiced

  • Reading comprehension - ensure that you draw the most important information from the related science lesson
  • Information recall - access the knowledge you've gained regarding the creator of the galaxy classification system
  • Knowledge application - use your knowledge to identify what is at the center of all galaxies

Additional Learning

To learn more about the universe, review the accompanying lesson titled Galaxy: Definition & Explanation. With successful completion of the lesson, you will master these learning objectives:

  • Define the term galaxy
  • Know the three main categories of galaxies
  • List the two main spiral galaxy types
  • Describe the Milky Way