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General Relativity is a theory of gravitation that describes gravity as a geometric property of space and time, or spacetime. It posits that massive objects cause a distortion in spacetime that is felt as gravity. This theory was developed by Albert Einstein between 1907 and 1915, and it has had profound implications for our understanding of the universe, from the behavior of black holes to the expansion of the universe. In this hierarchy, General Relativity serves as a foundational concept in Cosmology, helping to explain the large scale structure and dynamics of the universe, while also being rooted in the broader fields of Science and Astronomy. It provides a framework for understanding how matter and energy interact and shape the cosmos, making it an essential area of study within these disciplines.