Lecture 24: The Realm of the Nebulae
How did we come to understand that the Milky Way was just one of\nbillions of other galaxies in a vast Universe? This lecture\nreviews the history of how we came to recognize that the spiral nebulae\nwere, in fact, other milky ways like our own: vast systems of \n100s of billions of stars located millions of parsecs away. The\nkey to understanding their nature was finding the distances to the\nspiral nebulae compared to the size of our Galaxy.\nRecorded 2006 February 8 in 1008 Evans Laboratory on the Columbus campus\nof The Ohio State University.