What motivated Einstein to create General Relativity?

Question 4. How is modern cosmology linked with General Relativity?
What motivated Einstein to create General Relativity? What classic principles did he invoke to begin his thinking? What does GR say about the relationship between spacetime and gravity? What important property of the universe could Einstein have predicted, and what did he do instead? What observational results led to the conception, and acceptance, of the Big Bang model? What is Inflation, and how does it modify the Big Bang model? How does Inflationary Cosmology hint at the possible integration of Quantum Mechanics and General Relativity?

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