this post was submitted on 16 Jan 2025
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Comic Strips
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Isn't the universe a sufficiently large size? Why is it expanding then? What constitutes an "object"?
Most of the universe is empty space, and that's what's expanding. Empty space doesn't have any gravitational pull
Solid objects are 99.999999% empty space, too.
Yes, but nuclear forces are strong enough to keep the space within from expanding and hold the objects together. It's in the vast swathes of emptiness between galaxies that we typically see the exansion of space because gravity is too weak there to keep things together.