High temperatures and solar wind in the inner planets allowed most of the volatiles to be driven off the terrestrial planets, but not the Jovian planets.
Terrestrial planets have higher density than Jovian planets.Jovian planets are mostly gas and liquid, terrestrial planets are solid and rocky.Jovian planets are almost gaseous and they are larger than terrestrial planets.
Planetary theory is a theory about the formation of planets. According to the planetary system hypothesis, when a planetary system forms, there will be a protoplanetary disk with material from the nebula from which the planetary system originates. This material is gradually assembled by gravity to form small pieces.
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