👉 In cosmology, a sub-universe is a small region of space that is not visible to the naked eye. It can be thought of as being in between two observable universes or regions of space, such as the universe we observe from Earth. Sub-universes are often used to model the distribution of matter and energy in the early universe. They can also be used to explain the formation of galaxies and the structure of the universe itself. In more specific terms, a sub-universe
