How to Say "cosmos" in Spanish
The Spanish word for “cosmos” is “universo” — A2 level. This is a very common word in everyday Spanish.

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).
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