Uploaded April 2019 | Updated September 2026, 2 hours 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 1, Science and History.

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

Have questions about the content? We host live Q&A sessions on our sister channel Astronomy: State of the Art and on Twitch at TeachAstronomy, come join us and get your questions answered!

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