Most people believe that the Universe we reside in is infinite in size. By looking at the far reaches of space through powerful telescopes, we can see galaxies that science believes were some of the first to be formed after the Big Bang. Science is still trying to determine the outer bounds of our Universe.
But not all Universes are the same size, and no Universe is truly “infinite” in size, although they may be very large. There are Universes that are microscopic in size (that from their perspective seem incredibly large), and there are Universes that are larger than the one we exist in. There are dimensions that are a single dimension, and there are dimensions that exist in as many as 13 dimensions. There is no cookie cutter for a Universe, all are unique. There are a finite number of Universes; that number is currently 2,550,409. The limitation is currently based on the number of Leaders who had volunteered to be the leadership of the Source Energy Cloud for each Universe. Most Souls wanted to experience the Constructs from a personal perspective, which would preclude them from incarnating in their own Universe.
It is important to note that the Central Sun is not its own Universe, nor is it part of any Universe.
While the Source for each Universe has the authority to make the rules for each Universe, they must still abide by the requirements of the 7 Constructs (there is enough latitude in the Constructs to allow for this). While the Leadership of the Central Sun maintains authority over all creation, it is only in very rare cases that they exercise that authority; the Leadership from the Central Sun will query and coordinate with the Source Energies for any Universes to resolve any issues that may exist.
It is meaningless to estimate the “size” of the Universe we exist in; first, the Universe is still growing in size, so any estimation of the size is meaningless. Second, science will take that size measurement and try to calculate the number of Light Years to point X in order to determine the length of time required to reach that location with various types of spacecraft. But this thought neglects to consider wormholes, conduits through space that allow for the travel from one point to another in a relatively small amount of time (covering vast distances in very short periods of relative time).
Can a Soul from one Universe communicate with a Soul from another Universe? The quick answer is yes – the Transport and Space Constructs have provisions for this, but this kind of communication would have to go through the Central Sun, where any translations would be made.
Is it possible for a Soul to go from one Universe to another Universe? This is theoretically possible (and it is addressed in the Transport and Space Constructs), but it too would require transit through the Central Sun. This is not as simple as going from one location to another; there may be interdimensional changes that must be made, in addition to translation difficulties.
There are other considerations for different Universes. Universes may not just exist within different dimensions; they may have different Energy levels, polarizations, “phases” of their Energies, they may have different Time characteristics, different Physical Constants, and different elements. And one final degree of complication, many Universes are able to occupy the same space at the same time, with no interaction or knowledge of the presence of the other Universe.
So the Universe you live in is big, but it is not the biggest, nor is it the smallest.