Jovian planets

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jovian planet (outer planet) A general term used to refer to the four outer, giant, gaseous planets of the solar systemJupiter, Saturn, Uranus, and Neptune; it contrasts them to the small, rocky, inner or terrestrial planetsMercury, Venus, Earth, and Mars.

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jovian Adjective derived from Jupiter and used in descriptions of the planet. In planetary geology it is not usual to spell the adjective with an initial capital letter.