Distance: Parallax

• the nearest stars (for now) here, here, here, here; a glimpse at the future
• RECONS project data on the 100 nearest stars circa 2012

Parallax Revolution: Gaia

• fly through the Galactic Map
• Gaia app available

Stellar Spectra

• The Sun: overview, detailed database
• a sample of stellar spectra: here and here

Photons in Thermal Equilibrium: Blackbody Radiation

• Wien's law
  
  • infrared gallery
  • Helix nebula: burned-out star
• thermal radiation
  • blackbodies and Planck / thermal spectrum; spectrum simulator
  • Wien's law; toasty example
  • color temperature: Orion, Gemini
  • Stefan-Boltzmann law
  • effective temperature: the Sun

A Census of Stars: the Hertzsprung-Russell Diagram

• Gaia solar neighborhood HR diagram, and same with labels
• deluxe labelled HR diagram