At the first glance, the Universe seems infinitely complex. Then, when we look closer, we can see that mostly everything is made out of the same atoms. If we take a step deeper down the rabbit hole, we realize that everything is actually energy, filling up the empty space in ways dictated by various informational structures. Thus, the Universe, in all it’s magnificent complexity, only comes down to the trinity of Space, Energy and Information.
And all three are eternal.