An extensive list of on-line astronomy courses can be found at www.eckerd.edu/academics/nas/chn/sitescol.html. A few selections follow:

Foundations of Cosmological Thought

On-line textbook (without illustrations) by J. C. Evans

George Mason University,

Extensive course notes for introductory astronomy by J. C. Evans

Penn State University

Lecture notes for introductory astronomy by Eric Feigelson

Southampton University,

Third-year undergraduate course notes on galaxies and cosmology with diagrams and images

Stanford University

Course on galaxies and cosmology with images and diagrams

University of Oregon,

Course notes for `Cosmology and the Origin of Life', with images, by Greg Bothun

University of Washington,

Introductory astronomy lecture notes by Nick Strobel, with diagrams

Cosmology and the Origin of Life

Course from University of Oregon with on-line lecture notes.

Additional links

Includes brief presentations and Java applets on solar system motions, nuclear burning in stars, Hubble sequence of galaxies and more