this post was submitted on 26 Aug 2025
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What, exactly, is space-time? | Different approaches to understanding what space-time is help us understanding our reality (theconversation.com)
submitted 4 months ago by otters_raft@lemmy.ca to c/space@mander.xyz
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Opening paragraphs:

Few ideas in modern science have reshaped our understanding of reality more profoundly than space-time — the interwoven fabric of space and time at the heart of Albert Einstein’s theory of relativity.

Space-time is frequently described as the “fabric of reality.” In some accounts, this fabric is referred to as a fixed, four-dimensional “block universe” — a complete map of all events, past, present and future.

In others, it’s a dynamic field that bends and curves in response to gravity. But what does it really mean to say that space-time exists? What kind of thing is it — is space-time structure, substance or metaphor?

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