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• The Stars in Art and Nature
  
  
• Image of Betelgeuse using IR Interferometry (2010)
  
  
• The Harvard Observatory "Computers", Annie Jump Cannon, and stars of different colors
  
  
• The Harvard Spectral Classification Scheme
  
  
• Brightness and Distance (load Brightness.swf)
  
  
• Stellar Parallax
  
  
• Han Solo in the Original Star Wars
  
  
• What's on my shirt?
  
  
• The ESA's GAIA Mission
  
  
• The Inverse Square Law for Radiation
  
  
• The Modern Magnitude Scale
  
  
• Absolute Magnitude
  
  
• How Can We Know The Composition of the Stars?
  
  
• The Absorption Spectrum of the Sun
  
  
• Cecilia Payne Gaposchkin
  
  
• Hertzsprung and Russell
  
  
• A Basic HR Diagram
  
  
• PhET Orbit Simulator (Lab, binary + planet, remove planet)
  
  
• Stellar Sizes and Luminosity Class
  
  
• A Fully Loaded HR Diagram!
  
  

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