Astronomy - Cepheid Variables

Answer the highlighted prompt below. You MUST use EXAMPLES and DIAGRAMS in your reply. 

Lesson 11 – In Quest of the Universe Chapter 12

Measuring the Properties of Stars 

Assignment 11.1

Assignment Title: Cepheid Variables
Lesson 11

Objective:
Explain how Cepheid variables can be used as distance indicators.

Directions:
Cite using MLA any online references or local sources (newspaper, online journal, reference book, etc.) you have used in your research and your response.

Assignment Instructions:
Using information from the textbook and the internet, research Cepheid variables.

Explain, using examples and diagrams, how Cepheid variables can be used to calculate distance.