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even though the universe has got bigger it still has the same amount of atoms in. but when the universe began all the atoms tightly compact together so the universe was smaller

Actually it doesn't. From the first instant of the big bang until one to two billion years later, the universe was too hot to have any atoms, it was nothing but extremely hot individual subatomic particles in a sea of radiation. At the end of this period, the universe became just cold enough that atoms could begin forming (almost entirely hydrogen) and the sea of radiation became free to appear today as the 3K cosmic background radiation (enormously redshifted from its original temperature).

From then on, conservation of mass has kept the number of atoms constant (to within maybe 1% due to stellar nuclear fusion, supernovas, black holes, etc.).

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Q: Why has the universe got the same amount of atoms as it had when it began?
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