Mercury
Mercury appears to have a solid silicate crust and mantle overlying a solid, iron sulfide outer core layer, a deeper liquid core layer, and a solid inner core. The planet's density is the second highest in the Solar System at 5.427 g/cm3 , only slightly less than Earth's density.
Source: Wikipedia
rotation time
58.6 Days
revolution time
87.97 Days
radius
2,439.7 KM
average temp.
430°c