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.
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.
宇宙は広大だ。
The universe is vast.
宇宙の起源について研究している。
I'm researching the origin of the universe.
Literally 'great universe', a more poetic or philosophical term for the macrocosm. Rare in daily speech.
大宇宙の神秘に思いを馳せる。
I ponder the mysteries of the great universe.
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.
宇宙の真理を探求する。
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.
数学の世界は奥深い。
The universe of mathematics is profound.
マーベルの世界では何でも可能だ。
In the Marvel universe, anything is possible.
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.
宇宙飛行士になりたい。
I want to become an astronaut.
彼は自分の世界に閉じこもっている。
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.
宇宙は膨張している。
The universe is expanding.
彼女は自分の世界に住んでいる。
She lives in her own universe.
A myth about the beginning of the universe.
The story of the creation of the universe.
The concept of parallel universes is often used in sci-fi.