Galaxies

Some History

• What he heck are these nebulae? are they like these nebulae?
• Curtis-Shapley debate (1920)
• Hubble (the man) discovers a cephied in M31
• Hubble (the telescope): Cephieds in M100
  the recordholder: NGC 4603

Galaxy Demographics

• sprial: face-on, edge-on
• elliptical
• Irregular: LMC, SMC

Galaxy Rotation Curves

• Data: M33
  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: one canine example; others; IR world gallery
• Wien's law
  spectrum of the Sun
  Orion colors