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.