Virtual Astronomy Lab Home Java Applets Stellar Evolutionary Tracks Nucleosynthesis Processes Astronomy Quiz Java Astro Lab: A Collection of Applets for Astronomy On these pages you can find: - a stellar evolution applet This applet visualizes theoretical stellar evolution tracks, following the evolution of the star's age, luminosity, radius and effective temperature. The applet also allows users to view their own evolutionary tracks. - a particle collision applet Examples include the proton-proton chain reaction. - an introductory astronomy quiz