Cassiopeia A Timeline Story
The Cassiopeia A Timeline tells the story of the death of a giant star. It is written from a historical perspective, interwoven with the progression of astronomy-related events and technology that have given us the knowledge we have about stellar evolution.

Interactive H-R Diagram
Includes an animated version of the HR diagram to help you understand how a star changes throught its life. It shows how a star's brightness and surface temperature are measured throughout its life cycle.