The Spaceship Moon Theory, also known as the Vasin-Shcherbakov Theory, is a theory that claims the Earth‘s moon may actually be an alien spacecraft. The theory was put forth by two members of the then Soviet Academy of Sciences, Michael Vasin and Alexander Shcherbakov, in a July 1970 article entitled “Is the Moon the Creation of Alien Intelligence?”.
Their theory relies heavily on the suggestion that large lunar craters, generally assumed to be formed from meteor impact, are generally too shallow and have flat or even convex bottoms. Small craters have a depth proportional to their diameter but larger craters are not deeper. It is theorized that small meteors are making a cup-shaped depression in the rocky surface of the moon while the larger meteors are drilling through a five mile thick rocky layer and hitting a high-tensile “hull” underneath.
Additionally, the authors note that the surface material of the moon is substantially composed of different elements (chromium, titanium and zirconium) from the surface of the Earth. They also note that some moon rocks are older than the oldest rocks on Earth. They postulate that the moon comprises a rocky outer layer a few miles thick covering a strong hull perhaps 20 miles thick and beneath that there is a void, possibly containing an atmosphere.
In 1975, Don Wilson published Our Mysterious Spaceship Moon in which he compiled what he considered supporting facts for this theory.
In 1976 George H Leonard published Somebody Else Is on the Moon in which he reprinted numerous NASAphotographs of the lunar surface and suggested that large scale machinery was visible in these pictures. Readers have generally not been able to see these artifacts.
As for the latter, he notes that the moon is the only planetary body besides Earth on which extensive seismic observations have been made. These observations have constrained the thickness of the moon’s crust, mantle and core, suggesting it could not be hollow. Karen Masters of University of Portsmouth similarly suggests that, based on the behavior of objects interacting with the gravitational field of the moon, we can determine the mass of the moon. Given the observable size of the moon, we can then calculate the density, which strongly rejects the notion that the moon could be hollow.