bluish green
gas
Mars doesn't have rings. The giant planets (Jupiter, Saturn, Uranus, Neptune) do have rings.
Gas
i dont know sometimes
Molten rock
no
Neptune and Uranus
4.7 billion km
uranus has a turquoise color,due to the methane gas in it's atmosphere.
Uranus' atmosphere is mainly composed of methane, hydrogen, and helium. (Mainly)
Uranus and Neptune are often described as twins. They are about the same size and composition, and look similar.
Uranus has a blue-green color as does Neptune