this post was submitted on 05 May 2026
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Wouldn’t vacuum decay become permanently localized because it only travels at the speed of light?
The expansion of the universe happens everywhere all at once. So, once objects become far enough apart, the space between two objects can grow faster than the speed of light.
So, what’s to happen if a vacuum decay begins so far away that—even at the speed of light—it’ll never catch up to us?