Universe

Bubble of Spacetime

A **universe** can be interpreted as a -verse that comprises of a self-contained spacetime that can be of any shape (e.g. hyperspherical, flat, hyperbolic) and all of the contents within it. Contents of a universe can include, but are not limited to, planets, brown dwarfs, stars, galaxies, dark matter, dark energy, other forms of mass-energy, and even civilizations of entities. Spacetimes and their own contents disconnected from and causally independent from that of a given universe are typically called **parallel** to said universe. Finite or infinite sets of universes with some given relationship with one another are known as multiverses.

Universes can host restrictions on how objects within it can behave and interact with one another. These restrictions are known as the universe's **laws of physics**. Scientific progression by intelligent civilizations living within a universe involves the development of scientific theories that aim to accurately reflect physical relationships fundamental to universal laws.

Universes of finite age can start from an initial, generally extremely hot and dense, state known as a Big Bang from which it will "age" and expand from. Events that take place "before" a universe's Big Bang are generally not particularly meaningful to entities embedded within the universe as they are not part of the universe's spacetime. Depending on factors such as energy density, curvature, size, and topology, a universe can have many different expansion behaviours and end states. Examples of possible end states that can occur to an expanding universe include a Big Crunch, a Big Rip, and heat death.

Alternatively, a universe can refer to everything that can observed by a given reference entity. Our **observable universe**, for instance, is the set of all possible things within our own universe such that electromagnetic radiation potentially from said things has had enough time within the age of the universe to reach the planet Earth.

## **Interpretations**

Different interpretations of a multiverse containing multiple universes whether they are different structures often considered a multiverse by people or differing interpretations of a multiverse in different cosmologies can involve different interpretations of what a universe is and how they're structured. These interpretations can vary wildly in size and structure.

A Type I multiverse, interpreted as an infinite, isotropic, and homogenous universe itself, contains multiple observable universe-sized region of spaces identical to that of a given observable universe spaced apart by

10

10

115

{\displaystyle 10^{10^{115}}}

 meters that are interpreted as parallel universes.

When the (10+1)D universe of M-theory is interpreted as a multiverse, the (3+1)D Dirichlet membranes (D3-branes) that can have observable universes embedded in them can be interpreted as universes.

## **Multiverses**

Most universes are born from a multiverse in which there are multiple to perhaps an immeasurable number - which may or may not contain humans or life at all. In fact, some of them may be so hostile that chemistry or physics as we know them do not function properly.

## **Other information**

Travel between universes is possible for extremely advanced civilizations through the use of portals, dark energy, time maneuvering, or other space-warping mechanisms. Additionally, cosmic entities can traverse through universes easily. Most universes shall eventually "die" as the second law of thermodynamics ensures that energy becomes less and less usable over time. This may not always be the case with alternate physical laws, though.

A universe can have any amount of dimensions from 1 to Aleph-one.

## Types of Universes

Due to special properties a universe can have, it may be categorized differently from most since it's not just the laws of physics and possibilities that are different.

#### Multiversally bounded

These are universes that are born in multiverses, born from big bangs. These are the most likely to give birth to powerful civilizations since they are more safe and less bounded than other types of universes.

#### Soverses

If a universe is kicked out of a multiverse or is created outside of a multiverse, then it is categorized as a soverse, which is short for solo universe. These universes are usually more static than most since it is dangerous for an object with the dimensionality level as much as a universe to enter intermultiversal space. Even if a life where to from on a soverse, it is very unlikely for it thrive let alone survive long periods of time, even if they a civilization emerges, it is unlikely for it to reach Type Ⅴ because of the huge distances between it and a multiverse.

### Innaturalis

Latin for "unatural" any universe falling into this category is created by an advanced civilization or cosmic entity. They are not born from big bangs and are usually unnaturally organized and/or have properties meant to create and/or keep certain things. If a universe falls into this category, it could still be categorized as Multiversally bounded or Soverse.

### Pocket Universe

These are universes in which they come from a host universe; they are pockets of physics and possibilities different from the original universe but is not different enough to break free from it whether in space or time. They often confused with parallel universes because they are slight changes in possibility and laws of physics, but if they still exist in the same timeline or the smaller universe is still inside of the larger, than it is a pocket universe.

## Universe Classifications

* Universes by Communality
* Universes by Dimensions
* Universes by Nature
* Universes by shape and size
* Universes by Similarity
* Universes by their Relations