[00:00]	Binary Stars
[00:01]	Doppler Shifts
[10:49]	High Velocity Stars, Andromeda
[12:11]	One Star, One Planet
[12:52]	Two Stars, One Solar System
[13:19]	See-Saws
[16:28]	Binaries

Learning Objectives

1. Understand how a moving source can produce Doppler shifts (blue and red).

2. Visualize the effect of blueshift and redshift on key features in star and galaxy spectra.

3. Connect the relative masses of stars to their center of mass.

4. Define various types of stellar combinations: optical and visual doubles, and single- and double-lined spectroscopic binaries.