Mercury
Mercury is the smallest planet in the Solar System and the closest to the Sun.
Its
orbit
around the Sun takes 87.97 Earth days, the shortest of all the Sun's planets. Mercury is one of four
terrestrial planets in the Solar System, and is a rocky body like Earth.
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.
Mercury's surface is similar in appearance to that of the Moon, showing
extensive
mare-like plains and heavy cratering, indicating that it has been geologically inactive for billions of
years. It is more heterogeneous than either Mars's or the Moon’s.
Source: Wikipedia
