We may ask more to the point what is inside the Earth (here) or inside any 'celestial planetary body'?
Planets, moon....spherical bodies suspended in Space are containers.
Mores so where did the stockpiles of treasures go over these millennia past?
How long has the technology in some form been active in terms of low earth orbit?
The answers must be found in the past, as the more obvious forms have all been confiscated.
I have contemplated in the past that the moon may be a core to another planet or to an artificial sun?
Further that it may contain a dark matter type event, necessary to control phenomenon on Earth?
One term/word that definitely applies to the moon occulted.
Stellarmass13