text: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.\n\nThe first 4 are small rocky planets.  The next 4 are called gas giants because they are very large planets covered by gas, with small rocky or metallic cores.  Pluto is the closest large member of a group of objects in the outer solar system called Kuiper Belt Objects (or Trans-Neptunian Objects).