1. Chapter 3 Learning Objective 5
Kaiya and Avery

2. Goal 5
Show how the relative motion of a source of radiation and its observer can change the perceived wavelength of the radiation, and explain the importance of this phenomenon to astronomy.
It makes the wavelengths appear farther apart (red shifted) or closer together (blue shifted).
The importance of the Doppler effect to astronomy is that astronomers can tell the speed of a cosmic object along the line of sight by calculating the extent to which its light is blue shifted or red shifted.

3. Examples