Neptune is beeing developed as you read this

Neptune in numbers

Volume
6.2 x 1013 km3
Surface Area
7,618,272,763 km2
Mass
8.0 x 1026 kg
Density
1.638 g/cm3
Surface Gravity
11.15 m/s2
Atmosphere
Hydrogen, Helium, Methane
Distance to sun
4,498,396,441 km
Inclination
28.3 degrees
Neptune
Earth
Uranus is
3.9x
the size
of earth