A review of how astronomical information is handled, made available and tuned to various audiences, including education and public outreach. The information flow in astronomy is illustrated from source (cosmic objects) to end (mankind's knowledge). The contributing authors have done their best to write in a way understandable to readers not necessarily specializing in astronomy, while providing specific detailed information as well as pointers and bibliographical elements. There are also "lessons learned" sections where authors make a critical review of the experience gained.
