How can the universe be constantly expanding if the amount of matter never changes?
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Better to think of it as inflating like a balloon. The mass of the surface of the balloon didn’t increase either even though the balloon is twice its size in surface area if you inflate it.
You have to imagine the surface of the balloon is representing the universe and not the whole volume of air inside the balloon for this analogy to be a reasonable example.
The balloon analogy isn’t perfect but its a commonly used example.
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