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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.
Earth). Terrestrial planets are therefore those that are âEarth-likeâ, meaning they are similar in structure and composition to planet Earth. Artistâs concept for the range of Earth-like extrasolar planets that have been discovered in recent years.errestrial planets are therefore those that are âEarth-likeâ, meaning they are similar in structure and composition to planet Earth. Artistâs concept for the range of Earth-like extrasolar planets that have been discovered in recent years.