- Discuss stellar parallax, how it works, and how it is used as a tool in astronomy.
- Which spectral class has the highest surface temperature? Which spectral class has the coolest surface temperature? What is the spectral class of the sun?
- One of our tools for measuring cosmic distances is Cepheid Variable Stars. Explain how they allow the determination of distances. 4. The Hertz sprung-Russell diagram is a tool as useful to astronomers as the Periodic Table is to chemists. Explain the structure of the H-R diagram and what it tells us.
