Usage Note
Planetario as an adjective means 'relating to planets' (movimiento planetario); as a noun, el planetario is a planetarium — a domed theater projecting astronomical images. Context distinguishes the two. The plural is planetarios/planetarias. A related term is sistema solar (solar system).
Examples
"El movimiento planetario fascina a los astrónomos."
Natural Translation
Planetary motion fascinates astronomers.
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