As far as theories go, there are some pretty strange ones out there, but there are very few people that can actually contest the one that states that the Moon is fake after all and that it was brought here by the aliens all along.
This theory was originally started when the first man to lead the Commission of Lunar Exploration Dr. Jastrow stated that the Moon was the strangest object in space we’ve ever come across, even going as far as to call it “The Rosetta Stone of the Planets”.
Most believe that the surface is the only thing that is made out of rocks as if we were to dig straight down for three miles or so we’d eventually come across the durable metal or chemical component which makes it so resilient in the first place.
We know that the Moon is fake because of the past experiments that took place when scientists asked themselves the same question theorists ask themselves nowadays.
Ken Johnson even went as far as to throw a module back in 1969 at the Moon to see how it would react to what appeared to be the power of thousands of kilograms of TNT blowing up at once.
The Moon, to everyone’s surprise, sounded exactly like a gigantic bell of all things as if it were generally empty on the inside. The ringing only stopped half an hour later. The vibrations also implied that it had a metal layer too.
Source: favgalaxy.com