Pluto is the farthest away from the Sun. Pluto is also the smallest planet in the solar system. Pluto was the last planet discovered. Pluto has a moon called Charon. Charon was discovered in1978.Pluto's orbital period is 247.7 Earth years. Pluto's rotation is 153.3 Earth hours. Pluto's surface gravity is 0.05. Pluto's suface is made of Nitrogen ice, Water ice, and Carbon Dioxide ice. Pluto's atmosphere is made up of Nitrogen & Methane. Pluto's diameter is1440 miles. Pluto's composition is unknown. On Pluto, a one hundred pound person would way 5 pounds.