How to Say "universe" in Spanish
The most common Spanish word for “universe” is “universo” — use 'universo' for the general concept of the universe, especially in everyday contexts or when discussing scientific expansion.
universo
oo-nee-VER-sou.niˈβeɾ.so

Examples
Dicen que el universo sigue expandiéndose cada día.
They say the universe keeps expanding every day.
Estudiar el universo es el trabajo de los astrónomos.
Studying the universe is the job of astronomers.
Somos solo una pequeña parte del vasto universo.
We are just a small part of the vast universe.
Masculine Noun Rule
Since 'universo' ends in -o, it is a masculine noun. Always use the masculine articles with it: 'el universo' (the universe), 'un universo' (a universe).
Using the Feminine Article
Mistake: “La universo”
Correction: El universo. Remember, Spanish nouns have a gender, and you must match the article: 'el' (masculine) or 'la' (feminine).
cosmos
KOHZ-mohsˈkozmos

Examples
El cosmos es un lugar lleno de misterios por descubrir.
The cosmos is a place full of mysteries to discover.
Muchos filósofos antiguos creían que el cosmos era perfecto.
Many ancient philosophers believed that the cosmos was perfect.
Nuestra galaxia es solo una pequeña parte del vasto cosmos.
Our galaxy is only a small part of the vast cosmos.
The word doesn't change in plural
In Spanish, words ending in 's' that aren't stressed on the last syllable don't change their spelling when they become plural. You say 'el cosmos' for one and 'los cosmos' for many.
Always Masculine
Even though it ends in 's', this word is masculine. Always use masculine helpers like 'el', 'un', or 'este'.
Plural Spelling Error
Mistake: “los cosmoses”
Correction: los cosmos. Words like this stay the same; only the 'el' or 'los' changes.
General vs. Poetic Usage
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