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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.
[ video ]. In fact, the asteroid is so complex that Russell and members of his team are calling it the smallest terrestrial planet.. Vesta has an iron core, notes Russell, and its surface features indicate that the asteroid is differentiated like the terrestrial planets Earth, Mercury, Mars, and Venus.Differentiation is what happens when the interior of an active planet gets hot enough to melt, separating its materials into layers.esta has an iron core, notes Russell, and its surface features indicate that the asteroid is differentiated like the terrestrial planets Earth, Mercury, Mars, and Venus.