PLUTO 5.91 billion 2,274 km -400 F Methane .03 Nitrogen .03 247.7 years 122.52 -6.3872 no data 15.12 NEPTUNE 4.50 billion 49,500 km -360 F Methane 2% Hydrogen 85% Helium 13% 164.8 years 28.31 no data 16.11 7.84 URANUS 2.87 billion 51,800 km -193 C Methane 2% Hydrogen 83% Helium 15% 84.01 years 97.86 no data -17.9 5.52 EARTH 149.6 million 12,756 km 15 C Nitrogen 77% Oxygen 21% Other 2% 365.3 days 23.45 .99727 .239345 no data VENUS 108.2 million 12,104 km 482 C Carbon Dioxide 96% Nitrogen 3% Other 1% 224.7 days 177.36 -243.0187 no data -4.4