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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.
âEarth-likeâ. These are what is known as terrestrial planets, a designation which says a lot about a planet how it came to be. Definition: Also known as a telluric or rocky planet, a terrestrial planet is a celestial body that is composed primarily of silicate rocks or metals and has a solid surface.