This book offers a unique 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 indeed illustrated from sources (cosmic objects) to end (mankind's knowledge). The experts contributing to this book have done their best to write in a way understandable to readers not necessarily hyperspecialized in astronomy, while providing specific detailed information as well as plenty of pointers and bibliographical elements. Especially enlightening are those 'lessons learned' sections where authors make a critical review of the experience gained. This book will be read by researchers, teachers, editors, publishers, librarians, computer scientists, project managers, public relations officers, plus those in charge of astronomy-related institutions and associations, as well as all persons interested in the impact of mankind's understanding of the universe on society at large.