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5 months ago in Cosmology By Rani

Can we have a universe that doesn’t expand and never began?

I keep seeing fringe theories proposing a non-expanding, eternal universe with no Big Bang singularity. Is there actually a viable model out there?

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By Neethi Answered 1 month ago

There are proposals—tired light models, certain steady-state variations, some modified metrics. But they all stumble on the same wall: the cosmic microwave background. Its near-perfect blackbody spectrum, its isotropy, its temperature—these are exquisitely explained by an expanding, cooling universe that was once hot and dense. Non-expanding models have to perform heroic contortions to reproduce what the Big Bang model predicts naturally. The consensus isn't dogma; it's just the best fit for the data.

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