alt Hacker NewsWe do know why the universe is expanding. That's due to general relativity. That's well attested to high confidence.
We don't know why the expansion is accelerating. For that we have only speculation.
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direwolf20 • today at 1:55 AM
The universe is expanding due to general relativity... in the sense that Einstein literally wrote "... plus the expansion of the universe" into his equations.
It’s well understood that the expansion of the universe is not “due to general relativity”. General relativity does explain some details of that expansion.