The Cosmological Principle


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question 1 of 3

This is a fundamental principle and assumption of cosmology which says that on a large scale the universe is both homogenous and isotropic:

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1. ____ means that the universe looks approximately the same in all directions:

2. ____ means that one large region of the universe is approximately the same as any other large region of the universe:

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About This Quiz and Worksheet

Cosmologists cannot directly observe the structure of the universe, so they must use assumptions like the cosmological principle to further explain and describe the universe. Use this quiz/worksheet combo to check your understanding of key vocabulary and concepts involved with this principle.

Quiz and Worksheet Goals

In this assessment, you will be asked to identify terms and principles based on the following definitions:

  • The universe as a whole is homogenous and isotropic
  • The universe looks roughly the same in all directions
  • Any particular region of the universe is about the same as any other
  • The universe has no locations which are 'special'

Skills Practiced

  • Defining key concepts-ensure that you can accurately define key terms associated with the cosmological principle
  • Information recall-access the information you've gained regarding the structure and appearance of the universe
  • Reading comprehension- ensure that you understood the most important information concerning the cosmological principle

Additional Learning

Review the following lesson for more details about the cosmological principle. The lesson addresses many objectives, including:

  • Understand why cosmologists must make assumptions about the universe
  • Know how they use the cosmological principle to describe and further theorize about the structure of the universe
  • Differentiate between homogeneity and isotropy
  • Understand the implications of a universe that is both homogenous and isotropic