Where does the extra space come from as the universe expands? and if it’s just stretching, does that mean it somehow is getting thinned out?
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The space between things expands, right, but not the things themselves. So what of the space within things? Do solid objects have some force opposing the expansion of space within them? Do they even need a force? Is the expansion rate big enough to even notice at the scale of physical objects like stars and planets?
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