But although dark energy makes up most of the Universe’s energy today, it is only recently—after matter and radiation were diluted enormously by the Universe’s expansion—that the influence of dark energy began to compete with that of the other types of energy.
Again I am perplexed. If the energy density of dark energy is the same throughout the universe, and unchanging, does that mean that as the universe expands, there is more of it, and that the dark energy is somehow being created from the expansion of the universe?
Or, is the universe expanding across a pre-existing field of dark energy, larger than the universe itself -- as if the universe were water spilling onto the floor, expanding across the surface of the floor.
I don't think Dr. Randall is doing a great job of explaining dark energy, or even plain old ordinary energy here.
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