Much remains unknown about extragalactic jets, such as what they are made of and how they are launched, accelerated, and collimated; some observational evidence is available and some theories have been devised, but they do not fit together very well. Nevertheless, specialists have compiled what is known into a reference and inspiration for graduate students, teachers, and researchers who are interested in active galactic nuclei and their relativistic outflows. After an introduction and history, they look at theory basics, phenomenology, and particle acceleration in turbulent magnetohydrodynamics shocks. Annotation ©2012 Book News, Inc., Portland, OR (booknews.com)