NASA’s Chandra X-Ray Observatory has ushered in a revolution in X-ray astronomy. Over the last two decades Chandra has captured stunning celestial X-ray images, measured spectra and monitored light curves to reveal and map the hottest, most energetic regions of the universe. Written by leading experts in each sub-field to celebrate its 20th anniversary, this book includes current reviews of the major discoveries and scientific results made by Chandra. Documenting the progress, discoveries and developments implemented by the mission, this book provides its readers with a comprehensive review of the mission thus far and its potential future implications. Including beautiful images of celestial sources generated from Chandra, and multi-wavelength data, as well as 3D figures and movies, interactive illustrations are also used throughout to enhance the text.