The Universe

The Universe in Dragon Ball is consistently said to be infinite in expanse spatially, which is accurate as in our real world the totality of space would have to extend indefinitely as a unit of measurement.

Source: Daizenshuu: Volume 4

Raw:
未知なるものが息づく光と闇の無限空間

DeepL:
An infinite space of light and darkness where the unknown breathes

Source: Chozenshuu: Volume 4

Raw:
宇宙のしくみ 地球にとどまらず、宇宙のさまざまな星々を舞台に繰り広げられる孫悟空たちの犬活劇。悟空たちが住んでいる「地球」は、DB世きた ぎんがそく界では「北の銀河」に属しており、 みどりわくせい 「4032の緑の877惑星」と表現することができる。この世全体は球体をしており、さらに破壊神ビルスによって、この広大な宇宙そのものは全部で12あると言われ、悟空たちが冒険を繰り広げている宇宙は「第七宇宙」に属している、と伝えられた。この世はどこまでも果てしない広がりを見せ、DB世界は人知を超えた途方もないスケールを持つ世界観であることがわかるだろう。この第七宇宙は、サイヤ人やフリーザ一味、魔導師ビビディが生み出した魔人ブウなどにより、何百もの星が破壊された過去を持つ。また、悟空たちのふるさと・地球を含め、第七宇宙で起こるさまざできことかいおうまな出来事は、界王界の界王や界ちゅうりつてき たち王神たちによって、中立的な立場で見守られ続けているのだ。

DeepL:
The Structure of the Universe The dog-tired adventures of Son Goku and his friends unfold not only on Earth but across the various stars of the universe. The "Earth" where Goku and his friends live belongs to the "Northern Galaxy" in the DB universe's cosmic hierarchy and can be described as the "4032nd green planet in the 877th star system." The entire universe is spherical. Furthermore, it is said by the God of Destruction, Bills, that this vast cosmos itself consists of twelve universes in total. The universe where Goku and his friends adventure belongs to the "Seventh Universe." This world displays an endless, boundless expanse, revealing that the DB universe possesses a worldview of unimaginable scale, beyond human comprehension. This Seventh Universe has a past where hundreds of planets were destroyed by entities like the Saiyans, Frieza's forces, and Majin Buu, created by the sorcerer Bibidi. Furthermore, all events occurring in the Seventh Universe, including those on Earth, the homeworld of Goku and his companions, are continuously observed from a neutral standpoint by the Kaioshin of the Kaioshin Realm and the other Kaioshin.

Celestial Bodies:

It's also stated that not only are there countless amounts of stars and nebulae, but an infinite amount of galaxies throughout the entirety of the Universe.

Source: Chozenshuu: Volume 4

Raw:
宇宙 この世に存在するすべての天体を包み込んだ、果てしなく広がる空間。『魔界』と両立する、この世における一がのだ世界である。ドラゴンボールの世界では、字宙はあの世の下に位置し、不思議なな様の刻まれた壁によって密閉されている。宇宙の中には、無数の星が集まった『星雲』があり、星雲が無数に集まってできた『銀河』がある。各銀河は、それぞれ担当の界王が監視している。地球は北銀河のはずれにある銀河星雲、だ陽系に属しいる。図宇宙には、1応「宇宙警察機構」なるものが樣在している。ただしフリーザやサイヤ人たちに対抗する戦力は持っていない。

DeepL:
The Universe An infinitely vast expanse that encompasses all celestial bodies in this world. It is the primary world of this realm, coexisting alongside the "Demon Realm." In the Dragon Ball universe, the universe lies beneath the afterlife and is sealed off by a mystical barrier. Within the universe, there are "nebulae" formed by countless stars, and "galaxies" formed by countless nebulae. Each galaxy is monitored by its own Kaiō. Earth belongs to the Solar System, a star cluster located on the outskirts of the Northern Galaxy. The universe is also home to an organization known as the “Cosmic Police.” However, it lacks the military strength to counter threats such as Frieza and the Saiyans.

Source: Chozenshuu: Volume 4

Raw:
銀河 宇宙の中にある、局地的な星々の集まり。 星が集まって星雲を作り、さらにいくつかの星雲が集まってできた集まりを銀河という。宇宙の東西南北を担当している4人の界王は、実際にはこの銀河を監視している。東西南北の銀河という区分は、天界の神々や界王たちが、宇宙空間に無限に存在する銀河を統括するために、業務上使い出した単位である。

DeepL:
Galaxy A localized collection of stars within the universe. Stars gather to form nebulae, and a galaxy is a collection formed when several such nebulae come together. The four Kaioshin, who oversee the north, south, east, and west of the universe, are actually monitoring these galaxies. The classification of galaxies into north, south, east, and west is a unit of measurement adopted by the gods of the Celestial Realm and the Kaioshin for administrative purposes, in order to manage the infinite number of galaxies that exist in outer space.

Space-time:

Within the Universe or This World , there exists time. Meaning that time is within This World and is subject to being its measure of change. This would mean that it has its own space-time continuum because time would need a subject to change in order to exist. This subject being the three-dimensional space of This World.

Source: DB: Chapter 476

Raw:
*`さっきの超サイヤ人3ってのはな·········
あの世でしか使っちゃダメな技なんだ…

時間ってものがあるこの世では 使うエネルギーが大きすぎて一気に へトへトになっちまう……`*

DeepL:
*`That Super Saiyan 3 from earlier...
It's a technique you're only supposed to use in the afterlife...

In this world where time exists, the energy it consumes is too great—it'd leave you completely wiped out in an instant...`*

Conclusion

The Universe will scale to (Tier Low 2-C: Universal+).

Definition:

Low Tier 2-C: Universal+
Characters that are able to significantly influence, create, and or destroy a single fourth-dimensional space-time continuum.