[00:00]	Stellar Temperatures
[00:01]	Hydrogen Features
[11:56]	Spectral Types
[18:13]	Spectral Colours

Learning Objectives

1. Connect the temperature of a stellar core to the strength of its hydrogen absorption features.

2. Relate the chemical composition of a star to changes in features in its spectrum.

3. Know the pattern of stellar types and temperatures (O - B - A - F - G - K - M - L - T).

4. Relate the temperature of a stellar core to the likelihood of molecules surviving in its atmosphere.

5. Visualize the colors shown in Hubble Space Telescope images of star and planetary nebula as indicating the presence of key elements.