The terrestrial planets, Mercury, Venus, Earth and Mars are the first four planets from the sun. The next four, Jupiter, Saturn, Uranus and Neptune are the Jovian planets. Terrestrial planets are more dense than Jovian planets (owing to the two groups’ make-up, with terrestrial planets being rocky and Jovian planets being gaseous), but Jovian planets are larger in diameter and mass.
Jovian planets are also known as gas giants: Planets such as Jupiter (which is how the term ‘Jovian’ originated). These types of planets likely have a solid or heavy liquid core, but are comprised mainly of gasses. Terrestrial planets, on the other hand, are compact and rocky in composition, and have thin atmospheres.
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