1. Group the planets into Terrestrial and Jovian. (Note: Terrestrial planets have solid surfaces, dense and metallic core, nitrogen and carbon dioxide are abundant in their atmosphere while Jovian Planets have gaseous surfaces, less dense sore supposedly molten rock, hydrogen and helium are vastly presents in its atmosphere.) m The Sun Mercury Venus Terrestrial Planets Earth Mars Jupiter Saturn Uranus Pluto Neptune Jovian Planets​