Galaxy Demographics

• sprial:
  • face-on here, here, here, here, here and zoomed out here
  • edge-on here, here, here, here
• elliptical here, here, here
• Irregular: LMC, SMC, I Zw 18, antennae

Galaxy Rotation Curves

• Data: M33, M31
  Some examples of typical rotation curves
• Interpretation

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 examples: human, canine IR and optical
• Wien's law
  spectrum of the Sun
  Orion colors
• M104 galaxy: optical infrared

Dark Matter Candidate: Hot Gas

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