They all contain a gas based surface.
The outer plants are made out of gases mostly.
they al are outer planets.
They have in common is that they are the last planets in the solar system
they al are outer planets.
All of the outer planets are large in size, low in density, and have very thick atmospheres made primarily of hydrogen and helium.
They all have rings
they are all gas giants
All the inner planets are terrestrial planets.
They have no rings.
revolution
revolution
They orbit the sun.