What if cosmic inflation is wrong?
Ethan Siegel

The only addition to this excellent article that I would have appreciated would have been an emphasis that cosmic inflation did away with the idea that the universe began as a singularity with no dimensions. That is implied but not stated.

Cosmologists I’ve talked to about this have tended to say that when the universe formed, it was already infinite in extent or at least incredibly large.

Even just the “observable universe” likely wasn’t smaller than a proton in the beginning.

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