Astronomy Tutorials

Astronomy 121
The Solar System (Univ. Oregon)

Astronomy 122
Birth and Death of Stars (Univ. Oregon)

Astronomy 123
Galaxies and the Expanding Universe (Univ. Oregon)

Notes on Amateur Astronomy Optics
Image formation, aberrations, types of telescopes, and more (Advanced topics)

MIT's OpenCourseWare

The Solar System

Introduction to Astronomy

Hands-On Astronomy: Observing Stars and Planets

Extrasolar Planets: Physics and Detection Techniques

For the Advanced

MIT Department of Physics

Ned Wright's Cosmology Tutorial