Usage Note
Planeta is one of several nouns ending in -a that are masculine (el planeta, el idioma, el mapa) — a common gender-trap for learners. The phrase salvar el planeta ('save the planet') is extremely common in environmental discourse. The adjective planetario and the noun planetario (planetarium) derive from it.
Examples
"La Tierra es el único planeta habitable."
Natural Translation
Earth is the only habitable planet.
Related Words
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