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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.
All terrestrial planets have approximately the same type of structure: a central metallic core, mostly iron, with a surrounding silicate mantle. The Moon is similar, but has a much smaller iron core.Io and Europa are also satellites that have internal structures similar to that of terrestrial planets.ll terrestrial planets have approximately the same type of structure: a central metallic core, mostly iron, with a surrounding silicate mantle. The Moon is similar, but has a much smaller iron core.