Classify each planet as an inner planet or an outer planet. Planet A has 67 moons, and major parts of its atmosphere are hydrogen and helium. Planet B has rings but not much atmosphere. Planet C has no moons but has high volcanic activity Known as the red planet, planet D has high amounts of carbon dioxide in its atmosphere and has two moons. Planet E has a thin layer of atmosphere but no moons due to the effects of the Sun’s gravity. Planet F has 27 moons, and its atmosphere is mostly composed of hydrogen, helium, and methane.