Translation guide
The English phrase "the universe" refers to all of space, time, matter, and energy. In Japanese, the most common equivalent is 宇宙 (uchuu), but depending on context, other terms like 世界 (sekai) or 天地 (tenchi) may be used. This guide covers natural ways to express this concept.
the universe (metaphorical domain)
Use when referring to a specific sphere or realm.
Referring to the physical universe, outer space, or the cosmos as a whole.
The standard, neutral term for the universe or outer space. Used in scientific and everyday contexts.
The universe is vast.
I'm researching the origin of the universe.
Literally 'great universe', a more poetic or philosophical term for the macrocosm. Rare in daily speech.
Referring to the universe as the totality of existence, often in a philosophical or abstract sense, or as 'the world' in a broad sense.
Still the most common term, even for abstract or philosophical uses.
I seek the truth of the universe.
Often translates as 'world', but can mean the universe or all of creation in certain contexts, especially when paired with words like 全世界 (zen sekai, the whole world/universe).
Literally 'heaven and earth', an older term for the universe or all of creation. Found in classical or religious contexts.
Using 'universe' metaphorically to mean a specific world or realm, such as 'the universe of mathematics' or 'the Marvel universe'.
The most natural translation for metaphorical 'universe' as a domain or sphere. Often combined with a modifier.
The universe of mathematics is profound.
Can be used metaphorically, but often sounds more grandiose or scientific. Common in terms like 'parallel universe' (並行宇宙).
宇宙 (uchuu) primarily refers to the physical universe or outer space. 世界 (sekai) means 'world' and is used for metaphorical universes or the human world. For 'the universe' in a scientific sense, always use 宇宙. For 'the world of X', use Xの世界.
I want to become an astronaut.
He is shut up in his own little universe.
天地 (tenchi) is an archaic term for the universe. Using it in modern conversation will sound unnatural or overly poetic. Stick to 宇宙 or 世界 unless you are discussing classical literature or religion.
The universe is expanding.
She lives in her own universe.
大宇宙の神秘に思いを馳せる。
I ponder the mysteries of the great universe.
全世界の始まりについての神話。
A myth about the beginning of the universe.
天地創造の物語。
The story of the creation of the universe.
In the Marvel universe, anything is possible.
並行宇宙の概念はSFでよく使われる。
The concept of parallel universes is often used in sci-fi.