Uploaded April 2019 | Updated September 2026, 4 days ago

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Welcome to Astronomy: Exploring Time and Space, a course from Professor Impey, a University Distinguished Professor of Astronomy at the University of Arizona. Learn about the foundations of astronomy in this free online course here on YouTube. This video is part of module 4, Matter and Radiation.

Want to take the free course from start to finish, including assignments and quizzes to help your learning? Check out our course on Coursera:
coursera.org/learn/astro

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