Light and Atoms: the Quantum Microworld

"Ordinary" Matter

• atoms
• composition the periodic table

Thermal Radiation: Light as Thermometer

• temperature and glow color connection: backbody radiation
• blackbody spectrum app
• invisible heat: one canine example; others; IR world gallery
• Wien's law
  spectrum of the Sun
  Orion colors
  

Dark Matter Candidate: Hot Gas

• gas as dark matter
• galaxy clusters:
  • seen in optical light: Virgo, Coma, Abell 1689
  • seen in X-rays: Virgo, Coma, Abell 1689