In this lesson, we’ll learn how one scientist figured out the solution to the Great Debate. Using an amazing discovery, this scientist was able to finally determine exactly how big the Milky Way was, and what those spiral nebulae are.

Resources included in this episode:

Listening Questions

Discussion Questions

Download the free resources for this course on the “Cataloging the Universe” website:

https://www.sciencepodcastforkids.com/universe

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