Lecture 25: A Tale of Two Galaxies, The Milky Way and Andromeda

Andromeda is the nearest bright spiral galaxy to the Milky Way, and a near
twin in terms of stellar and gas content. This lecture discusses
the idea of stellar populations and chemical evolution in galaxies
as determined by combining observations from within (the Milky Way) and
without (Andromeda). At the end, two other features of these galaxies,
their supermassive central black holes, is introduced, setting up a question
to be addressed in later lectures.
Recorded 2006 February 9 in 1008 Evans Laboratory on the Columbus campus
of The Ohio State University.