Hard to wrap my mind around this one. Anyone have any good analogies that fit?
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Some explanations depend on different theories you might subscribe to. I personally prefer the dark energy, infinite cosmos explanation
Imagine a flat spacetime, accelerating almost infinitely fast in all directions. WAYYY faster than the speed of light. But because space is always fluctuating with energy, at some point it’s destined to pop open a bubble of energy somewhere. Then you take that 100% pure energy bubble that’s infinitesimally small and expand it by unbelievable magnitudes at breakneck speed. The universe was the size of a marble at around 10^-31 seconds and grew faster in ONE second than the following 14 billion years of cosmic expansion that followed it. And after that 1 second, it was still 100% pure energy. 100% full, at literal cosmic scales. That should give you an idea of just how much “stuff” there is. Because matter bends space, you get gravity, and then gravity helps slow down a lot of that expansion. But eventually dark energy wins over and expansion happens again. Not at inflation rates – that’s way in the future/past depending on how you view time.
Because spacetime now is accelerating in all directions, eventually our universe will result in “heat death” which is basically everything goes super far away from each other and everything just decays away as the universe keeps expanding and expanding faster and faster. We’re eventually left with an ever expanding flat universe with basically nothing in it – Which sounds awfully similar to our initial starting condition. Which is why I think it’s true. It’s just a cyclic model.
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