The Moon, being a sphere, has a core. That is, there is a geometric spot in the center of it.
Nobody can "know" what is there, so there can only be "theories". I believe the present theory is that the Moon, being the remnant of the Earth's crust and the gigantic impactor which formed the Moon, is mostly non-magnetic stuff. Compressed regolith.
--Boris
Impact-splash, as a theory of earth-moon formation, is just that : a theory, not a religious tenet to be hyped by Jehovah's Witness type astronomers. It fails on 2 counts : tiny target on the proto-earth's terminator for the mars-sized impactor to hit, given the VAST area for earth orbit crossing asteroids to orbit around in, so as to re-launch a lunar mass beyond the roche lobe. And when a mars directly impacts an earth you get some 10^31 J of instant KE release, a gamma ray burster similar(but FAR larger than) the SL9 comet fragments hitting Jupiter in 1994. Even at 4.4 billion years ago that means no H2O oceans would have appeared on earth by 3.9 B years ago. We wouldn't even BE here, as water-rich critters, if I-S had happened. Wanna know where I-Sers went wrong and what REALLY happened?