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The Moon is a differentiated body: it has a geochemically distinct crust, mantle, and core.
The Moon has a solid iron-rich inner core with a radius possibly as small as 240 km (150 mi) and a fluid outer core primarily made of liquid iron with a radius of roughly 300 km (190 mi).
Giant impacts are thought to have been common in the early Solar System.
Computer simulations of a giant impact have produced results that are consistent with the mass of the lunar core and the present angular momentum of the Earth–Moon system.
Following Jupiter's satellite Io, the Moon is the second-densest satellite among those whose densities are known.The Moon's average orbital distance at the present time is 384,402 km (238,856 mi), or 1.28 light-seconds.