Black hole cosmology suggests that the Milky Way and every other observable galaxy in our universe is contained within a black hole that formed in another, much larger, universe.
The theory challenges many fundamental models of the cosmos, including the idea that the Big Bang was the beginning of the universe.
It also provides the possibility that black holes within our own universe may be the boundaries to other universes, opening up a potential scenario for a multiverse.
Mine blown 🤯
“Time” exists in any reality that isn’t static, it’s simply the concept of being with any measureable change. Doesn’t have to be linear or consistent but if there’s two quarks then there’s time.
It does seem somewhat likely that the flow of time would be different if other universes exist. Hard to apply our physical laws to guesses entirely outside observable reality.