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This edition: Galaxies





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Episode Details

Dr. Steve Beckwith, Dr. Brent Tully, and other galactic experts explain how astronomers in the 20th century defined the expanse of the universe with the ability to measure the vast distances to galaxies using various distant indicators. The lesson includes the classification of galaxies, their evolution, and interaction with other galaxies.

  • About this series

  • The series explores a broad range of astronomy topics, concepts, and principles, from the motions of the visible sky to dark matter, from our own planet to the stars and galaxies. It examines evidence for the big bang and continuing evolution of the universe and tracks the formation, life, and death of stars. It is based on the book Horizons: Exploring the Universe by Michael A. Seeds.

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