This 2nd edition of the original Galileo's Classroom collection of ready-to-use astronomy lesson plans meets inquiry-based teachers' and professors' needs for innovative astronomy classroom activities. Today, teachers and professors across the planet have embraced the same challenge Galileo encountered-to share the excitement of astronomy with their students. And, as it was in Galileo's time, simply asking students to memorize facts, figures, and formulas are far from appetizing. Galileo's Classroom (2ed) is a generously donated collection of classroom-ready astronomy lesson plans contributed by some of today's most notable and enthusiastic astronomy educators. Although most of these activities require no specialized equipment, some teachers have found that these astronomy teaching activities nicely align with the capabilities of the easy-to-use and inexpensive Galileoscope. This collection was compiled and edited by Stephanie Slater, Janelle Bailey, and the late Michael Gibbs from the generous contributions of: Doug Arion, Mike Brotherton, Kevin Grazier, Erika Grundstrom, Inge Heyer, Michael LoPresto, David McKinnon, Cherilynn Morrow, Steve Pompea, Stephanie Shipp, Christine Shupla, Kendra Sibbernsen, Rob Sparks, Timothy F. Slater, and Connie Walker.