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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.
Characteristics of Jovian Planets. Planets in the Solar System can be placed under two categories: terrestrial planets and jovian planets. Terrestrial planets are small planets made of rock, while jovian planets, also referred to as the 'gas giants', are made up of gaseous substances, mostly hydrogen. The mass of these planets is more than 10 times that of the Earth. 2  They have very small cores as compared to the terrestrial planets. 3  Gas storms are a common phenomena on the surface of the jovian planets.