The Observable Universe vs. the Entire Universe


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question 1 of 3

Our cosmic light horizon's radius is estimated to be:

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1. Light from very distant galaxies is nearly infinitely ___~, partially explaining the darkness of the night sky.

2. The part of the universe we can see from our location in space is known as the:

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About This Quiz & Worksheet

Test your knowledge of the universe with this interactive quiz and worksheet. Be ready to answer questions on the boundary of the observable universe and why distant galaxies appear so dim to us.

Quiz & Worksheet Goals

In this assessment you'll be asked to:

  • Give the approximate length of the cosmic light horizon's radius
  • Describe the light from very distant galaxies
  • Name the part of the universe that we can actually see
  • Identify the term for the edge of our observable universe
  • Select the amount of time the light from the most far away objects we can see has had to travel to reach us

Skills Practiced

This quiz and worksheet allows students to test the following skills:

  • Reading comprehension - ensure that you draw the most important information from the related lesson on the observable and the entire universe
  • Knowledge application - use your knowledge to answer questions about the universe
  • Information recall - access the knowledge you've gained regarding the cosmic light horizon

Additional Learning

To learn more about the universe, review the accompanying lesson titled The Observable Universe vs. the Entire Universe. This lesson covers the following objectives:

  • Understand Olbers' Paradox
  • Learn why the night sky is dark
  • Explain cosmological redshift and how it affects what we can see