What are the different types of galaxies? What hints can they give

us as to the structure and evolution of galaxies? This lecture

introduces the Hubble Classification System for galaxies, and describes

the properties of each major class. This detailed overview gives us

some tantalizing clues as to the formation and evolution of galaxies

that will be picked up in subsequent lectures.

Recorded 2006 February 13 in 1008 Evans Laboratory on the Columbus campus

of The Ohio State University.