The one theory that can be regarded as our best chance to completely understand and explain the known and unknown Universe is, The String Theory.
String theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String theory describes how these strings propagate through space and interact with each other.
These strings extend and vibrate at their own frequencies across dimensions. And each vibration is a different particle.
Theoretically, one might consider the entire Universe as a web of these cosmic strings, looped and intertwined with each other across 11 dimensions of Space-Time.
Theoretically, what we can perceive as just particles, are actually these strings twisted and spread in complicated ways.
And based on the same theory, we can hypothesize an existence of Multiverse, populated by at least 10^500 different Universes.
Given the complex structure of Universe, comprised of trillions of quadrillions of these strings, if one were to look at it from a quantum viewpoint, these strings could very well be the roads of the Multiverse.
We live in a Universe built-up of objects with different number of dimensions. Just like we are a 3 dimensional species, ants, a 2 dimensional; in the same way, there has to be something or someone who can perceive Space-Time beynd 3 dimensions and also, someone who or what exists in 1 dimension.
We don’t know yet about creatures who exists beyond 3 dimensions, but we have tried to posit that particles are one-dimensional, string-like entities whose vibrations determine the particles’ properties, such as their mass and charge.
But while being one dimensional, particles also possess the ability to exist across time and dimensions.
Particles are an object that exists throughout the Universe, and most certainly, the Multiverse.
But there is always a possibility that the particles in one Universe might exist in that Universe alone, crediting to the frequency of vibration of that particular Universe.
But if we consider the origin of particles to be somewhere in a place where all dimensions merge into one and create one dense quantum universe – A Quantum Singularity, the birth of everything else in the Multiverse, that may not end up being entirely true.
On a quantum level, Universe does make a lot of sense.
Every string, connecting all the dimensions of space and time and the sub-space together.
To us, it may seem odd to learn about Dark Matter and Dark Energy – something that exists but cannot be perceived by us, but on a quantum level, all of it just… Exists!
P.S. On Quantum Levels, Universe is a lot more than what some of us can understand right now.