Exercises are designed to reinforce essential ideas covered, while allowing you to assess whether you “got it.” Click on the Start Quiz button to begin. When presented with a question, you must select the best answer, and then click on the Check button. Next, you’ll see whether you’ve answered correctly or incorrectly, along with a corresponding explanation. Click on the Finish Quiz button to see your overall results. Exercises are not graded, and you can always click on the Restart Quiz or the View Questions buttons before clicking on the arrow to advance to the next course element.
The Expanding Universe Exercise
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