Lecture 35: The Cosmic Distance Scale

How do we measure distances on cosmic scales? This lecture describes
the rungs in the cosmic distance ladder from measuring the AU in our
own Solar System out into the Hubble expansion of the universe. These
distances form the basis of the measurements that let us piece together
the present, past, and future history of the expanding Universe, setting
the stage for next week's lectures.
Recorded 2006 February 24 in 1008 Evans Laboratory on the Columbus campus
of The Ohio State University.