Near the beginning of his career, Einstein thought thatwas no longer enough to reconcile the laws of with the laws of the . This led to the development of his . He realized, however, that the principle of relativity could also be extended to , and with his subsequent theory of gravitation in 1916, he published a paper on the . He continued to deal with problems of and , which led to his explanations of and the motion of molecules. He also investigated the thermal properties of light which laid the foundation of the theory of light. In 1917, Einstein applied the general theory of relativity to model the structure of the as a whole.
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