Is time something that flows — or just an illusion? Exploring space-time as either a fixed “block universe” or a dynamic fabric reveals deeper mysteries about existence, change, and the very nature of reality.
Few ideas in modern science have changed how we understand reality as deeply as space-time, the intertwined union of space and time at the core of Albert Einstein’s theory of relativity.
Space-time is often described as the “fabric of reality.” In some explanations, this fabric takes the form of a fixed, four dimensional “block universe,” a complete map of all events in the past, present, and future.
In other explanations, it is a dynamic field that bends and curves in response to gravity. This leads to a deeper question: what does it mean to say that space-time exists? What kind of thing is it: structure, substance, or metaphor?
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