Orbital mechanics, propulsion, rocket hardware, space centers and missions are among the topics featured on Robert A. Braeunig's Rocket and space Technology page. Braeunig is a civil engineer whose hobby is learning about space flight. This page is well-researched, and all sources are credited. The text disseminates relatively simple explanations of the mechanics of rocket flight and includes definitions of important terms and black-and-white diagrams. Sample problems, tables, and formulas make the site useful to secondary educators and students. The science and mathematics behind everything from building a spacecraft to launching it are covered in this instructional site.