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Terrestrial Planets | Jovian Planets | Dwarf Planets | Planet Density | Planet Rotation. The first four planets are the terrestrial planets. A terrestrial planet has a metallic core (usually iron) and a rocky surface. The atmosphere of each terrestrial planets varies. Mercury has almost no atmosphere, while the surface of Venus has an atmospheric pressure 90 times that of the Earth! NO MOVIE.
Even though, the Jovian and terrestrial planets differ in structure, all of them have a solid core. But relative to the overall size of each planet, the cores of the terrestrial planets are larger than the cores of the Jovian planets.lanets in both groups have a gaseous atmosphere, but it is very thin in the case of terrestrial planets. All planets are capable of exerting gravtiational force, but the Jovian planets have larger gravitational fields, which help them hold on to their large gaseous atmospheres and numerous moons.