'Variable Stars - What makes them Tick?' - Variable stars are common: what makes (some of the) different types of star vary.
The areas discussed include:
| Background | All stars vary; Some of the categories; Naming conventions; AAVSO; Julian date |
| Eruptive Variables | Luminous Blue Variables (LBV's); T Tauri stars; R Coronae Borealis stars |
| Pulsating Variables | 53 Persei; Cepheids; W Virginis; RR Lyrae; Mira; RV Tauri; ZZ Ceti |
| Cataclysmic Variables | Novae; Supernovae Type Ia; Supernova classification; Supernovae Type II; Dwarf novae; Anti-dwarf novae; Nova-like stars |
| Rotating Variables | Starspots; Ellipsoidals; Pulsars |
| Eclipsing Variables | Algol Types; Ellipsoidal systems; Reflection effect; Planetary eclipses |