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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.
photo credit Nasa / Goddard Space Flight Center / Reto StÃ¶ckli. Terrestrial Planets vs. Jovian Planets (Gas Giants) What are the Terrestrial Planets & what are the 3 things they have in common? The Terrestrial Planets are Mercury, Venus, Earth & Mars. 3 similarities between the four planets include: They are all composed of rock & metals. They are all smaller than gas giants They all have few or no moons at all.