Astronomy Textbook — A free, open source Introductory textbook to Astronomy from OpenStax Astronomy timeline — A very concise history of Astronomy Astronomy MOOCs — A list of open courses in Astronomy Astronomy courses — A
compilation of MOOCs Crash Course Astronomy
videos — If you are new to Astronomy and short on time, these
youtube videos offer a good start Silicon Valley Astronomy lectures — Audio and
video of well - known scientists explaining astronomical developments in everyday language.