The outer planets are gas giants and are made of huge mounds of gases. These planets are Jupiter, Neptune, Uranus and Saturn. They all have satellites revolving round them.
The terrestrial planets are small rock masses. They are mercury, venus, earth and mars. Earth has one satellites and Mars has two satellites.
The asteroid belt seperates the Jovian and terrestrial planets. Beyond the Jovian planets lies the Kuiper Belt Objects or KBOs.
