[ISM and Star Formation | AY 201b Student Textbook This "book" accompanies the Harvard University graduate course Astronomy 201b, "The Interstellar Medium and Star Formation." The first incarnation was created in 2011 by Prof. Alyssa Goodman, Teaching Fellow Chris Beaumont, and the 21 Harvard graduate students who took the course at that time. The "book" will continue to evolve throughout Spring 2013 as student contributions…]