The Essence of General Relativity site gives a history of general relativity. This site gives descriptions, explanations, and figures of how this theory came about to help the user understand why General Relativity became the next physics paradigm.
9-12: 4F/H2. All motion is relative to whatever frame of reference is chosen, for there is no motionless frame from which to judge all motion.
9-12: 4F/H3c. In empty space, all electromagnetic waves move at the same speed—the "speed of light."
10. Historical Perspectives
10C. Relating Matter & Energy and Time & Space
9-12: 10C/H4. A decade after Einstein developed the special theory of relativity, he proposed the general theory of relativity, which pictures Newton's gravitational force as a distortion of space and time.
9-12: 10C/H5. Einstein's development of the theories of special and general relativity ranks as one of the greatest human accomplishments in all of history. Many predictions from the theories have been confirmed on both atomic and astronomical scales. Still, the search continues for an even more powerful theory of the architecture of the universe.
Epp, R. (2008, July 7). Perimeter Institute: Essence of General Relativity. Retrieved February 26, 2015, from http://www.perimeterinstitute.ca/en/Outreach/Explore_Our_Universe/Essence_of_General_Relativity/
Epp, Richard. Perimeter Institute: Essence of General Relativity. July 7, 2008. http://www.perimeterinstitute.ca/en/Outreach/Explore_Our_Universe/Essence_of_General_Relativity/ (accessed 26 February 2015).
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