The outer planets are planets in the Solar System that are beyond the asteroid belt. The four planets; Jupiter, Saturn, Uranus and Neptune are gas giants. All four of these planets have planetary rings which are made up of dust and other particles.
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- Outer Planets Assessment Group (NASA)
- Planetary Science Decadal Survey Mission & Technology Studies Archived 2017-12-18 at the Wayback Machine
- Dwayne Day – Exploration of the Outer Planets – U.S. Centennial of Flight Commission Archived 2011-04-13 at the Wayback Machine ~2003