Lesson 1 - The Scale of the Universe

Get ready to  meet two famous astronomers just before they face off in a scientific argument. “The Great Debate” was about the biggest astronomy question of their time: How big is the universe, and how do we know? Marshall travels back in time to interview them, and find out why unusual objects in the sky called spiral nebulae may be the key to determining the size of the universe.  Resources included with this lesson: Listening Comprehension Questions Discussion Questions Shapley & Curtis Graphic Organizer Download the free resources for this course on the “Cataloging the Universe” website: https://www.sciencepodcastforkids.com/universe