Albert Einstein is best known for his theory of relativity, which is a set of ideas about the nature of space and time. In simple terms, the theory of relativity says that space and time are relative, rather than absolute, quantities.
This means that the way we measure time and space can change depending on our perspective. For example, two people moving at different speeds will experience time differently, and the same is true for the way they experience the distance between two objects. The theory of relativity also suggests that the speed of light is constant, and that the force of gravity is caused by the curvature of space and time.
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