According to Einstein's theory of special relativity, space and time are not separate and distinct entities, but are instead part of a single four-dimensional fabric known as spacetime. This means that space and time are interchangeable, and are affected by the presence of mass and energy. For example, an object with a lot of mass will warp spacetime around it, causing nearby objects to follow a curved path. The effects of this curvature can be observed as gravitational forces, and can even cause time to slow down or speed up depending on the strength of the gravitational field. Similarly, objects that are moving at different speeds will experience time differently, with time appearing to move more slowly for objects that are moving at high speeds. This concept of spacetime has been confirmed by numerous experiments and observations, and has had a profound impact on our understanding of the nature of the universe.
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