Mercury is beeing developed as you read this

Mercury in numbers

Volume
60,827,208,742 km3
Surface Area
74,797,000 km2
Mass
3.3 x 1023 kg
Density
5.427 g/cm3
Surface Gravity
3.7 m/s2
Exosphere
Oxygen, Sodium, Hydrogen
Distance to sun
57,909,227 km
Inclination
0 degrees
Venus
Earth
Venus is
0.38x
the size
of earth