The outermost coldest, and smallest planet appears to be a snowball of methane and water mixed with rock. Pluto and its moon, Charon, are called a double planet. During each revolution Pluto passes inside Neptune's orbit for a 20 - year period, the most recent one began in 1979.
Satelites/Moons:1 in total: Charon(diameter: 1,200 km).
DISTANCE FROM SUN:5,900,000,000 km.
REVOLUTION AROUND SUN:248 years.
ROTATION:6.4 days.
DIAMETER:2,300 km.
DENSITY:2 * that of water.
MASS:0.003 * that of Earth.
SURFACE TEMPERATURE:minus 230 C.
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