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Jovian planets

Jovian planets, the planets Jupiter , Saturn , Uranus , and Neptune . They are all larger and more massive than the earth. Since they rotate faster, they are more flattened at the poles than are the terrestrial planets . They are less dense than the earth, as they are composed of gaseous matter, predominantly hydrogen.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.