World Science Scholars
1.4 Vera Rubin and Dark Matter

Exercises are designed to reinforce essential ideas covered, while allowing you to assess whether you "got it." Accordingly, when presented with a question, you must select the best answer, and then click on the blue Check button. Next, you'll see whether you've answered correctly or incorrectly, along with a corresponding explanation. Exercises are not graded, and you can always go back and restart the quiz. After answering the last question and clicking "Finish Quiz", please wait for your results to be recorded and then click the "Mark Complete" button to indicate that you’ve completed this course element.

The 4% Universe Exercise

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