Of course, there are other physical characteristics that can affect the evolution of rocky inner planets in stellar habitable zones.
Unlike rocky inner planets such as Earth, Saturn and the other gas giants have no surface on which to land.
The Solar System as we know it today contains 8 planets - the four rocky inner planets of Mercury, Venus, Earth and Mars, and then the four gas giants, comprising Jupiter, Saturn, Uranus and Neptune, ...
Currently there are gas giants and rocky inner planets. Perhaps we need to explore the makeup of *other* solar systems to more clearly be able to define our own.
Mars is the last of the rocky inner planets. When seen in the night's sky Mars has a reddish colour and to the Roman's this fiery planet was the bringer of war.
Models also suggest that giant planet formation is a critical feature of planetary systems in general, and may govern the formation and early evolution of rocky inner planets that can possess habitable environments.
It is not yet known whether our solar system, with rocky inner planets ideal for life, is of an aberrant configuration.
 See also: Planet, Earth, Orbit, Solar System, Solar
  
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