Modern Physics, Serway, Moses, Saunders College Publishing Fort Worth TX, 1997
Astronomy Today, Chaisson, McMillan, Prentice Hall Publishing Upper Saddle River, NJ, 1996
The Principle of Relativity, A. Einstein, H. Weyl, H. Minkowski, Dover Publications NY,NY 1923,1952
Cosmology and Controversey, Helge Kragh, Princeton University Press, Princeton NJ, 1996
http://www.pas.rochester.edu/~afrank/A105/LectureXVI/LectureXVI.html
 
 

Credits:
Web Pages, equations, text, diagrams in digital form (except cosmic timeline): Brian Miller