The highly successful course that has been offered on Coursera by Ronen Plesser at Duke University is closing down. This means that you still have until the end of March 2016 to download the course material.
The title “Introduction” to Astronomy is a bit misleading, as the content is very comprehensive and goes quite deep for the average lay person.
See the Course Overview and Syllabus here.
When you are signed up as a student at Coursera, you can use the following links:
See the explanation for the shutdown here.
Download the course material here.
Additional resources can be found via the menu on the Course website.
We can highly recommend this course for anyone with a serious interest in Astronomy and Cosmology.