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scale of the universe

Physics can meaningfully describe distances from the tiniest scale imaginable up to the edge of the observable universe — a range spanning roughly sixty factors of ten. Humans sit, very roughly, near the middle of it. That's tempting to read as special, but it's mostly an artifact of where we drew the range's edges in the first place — set by the limits of our own instruments, not some deeper fact about our size. What is real: only a narrow band of that entire range can support atoms, chemistry, or anything like an observer — and how narrow it is traces back to the same handful of finely-tuned physical constants that make stars and life possible at all.

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