Sun (Proper name: Sol) Mercury Venus Earth [u][b]Mars[/u][/b] Asteroid Belt- contains Ceres (Dwarf Planet) Jupiter Saturn Uranus Neptune [u]Kuiper Belt[/u] (contains these dwarf planets, and is beyond the orbit of Neptune) Pluto (dwarf Planet) Sedna (Dwarf Planet) Eris (Dwarf Planet) Haumea (Dwarf Planet) Makemake (Dwarf Planet) As you can see, OP; Mars is not the farthest planet, nor will it be the coldest. While Mars is in the "green zone" of Sol (necessary to have enough heat to support liquid water and thus life), it is on the outer most edge of that same "green zone".