The video has been divided into seven chapters that can be paused as needed to facilitate further discussions. This section provides extra information on each chapter.

Chapter 1 - Introduction
Chapter 2 - Measuring the Mass of the Sun
Chapter 3 - Measuring the Mass of a Galaxy: Orbital Method
Chapter 4 - Measuring the Mass of a Galaxy: Brightness Method
Chapter 5 - Evidence from Einstein
Chapter 6 - Failed Ideas About Dark Matter
Chapter 7 - Current Theories of Dark Matter

Mathematical Appendices