eli5: Does expansion of the universe not cause reduction in mass and energy? How does does the mass and energy of an expanding universe remain constant and not reduce or diffuse?
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The universe is everything. It is not expanding into something else and there is no way to leave it. Mass and energy are spreading out over time but currently other factors such as gravity are holding parts of it together. It’s also good to note that energy is going to be spread out for other parts of it to become more ordered. Your body is complex and ordered but for it to function it is causing energy to be more spread out than the order that is created. Look into the laws of thermodynamics for more information.
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