Universe

The Universe is the set of dimensions where we live. It is commonly known as the totality of everything that exists, containing the Galaxies, planets and suns.

The Universe has many dimensions such as Ledger Domain and the Null Void as well as many alternate timelines called Crosstimes.

As noted by Professor Paradox in The Forge of Creation, many other universes also exist, with different physics from ours, just outside of our own.

The Map of Infinity
The Map of Infinity is a complete map of space-time extending through seventeen dimensions. Anyone who has the Map can travel anywhere, including outside the Universe and the Forge of Creation: a nebula in which the reality-warping species know as Celestialsapiens are born.

Known Galaxies
There are about 80 billion galaxies discovered by humans.
 * Milky Way Galaxy
 * Andromeda Galaxy

Known Dimensions

 * Null Void
 * Ledger Domain
 * Dimension 12
 * Diagon's World
 * At least 100 others that have been enslaved by Diagon

Alternate Realities

 * Dimension 23

Parallel Universes

 * Dragon Ball Universe
 * Mushroom Universe

Timelines

 * Alternate Ben 10,000 Timeline
 * Gwen 10 Timeline
 * Race Against Time Timeline
 * Paradox's Failure Timeline
 * Gwen Alters the Past Timeline
 * Protector of Earth Timeline
 * Alien Force Video Game Timeline
 * Vilgax Attacks Timeline
 * The Rise of Hex Timeline
 * Cosmic Destruction Timeline
 * Omniverse Video Game Timeline