This may be a silly question but it just popped into my head yesterday. Are there a definite number of atoms in the universe? Because if the universe is expanding, then does that mean that there are more atoms in the universe or is everything just being pulled farther apart? (however, that logic really does not make sense because as things move apart then something else moves in to taking up the newly empty space) If, however, there are more atoms then where could they possibly be coming from? Does this just lead back to how was the universe was created in the first place?