Since man evolved eyes, he has gazed up at the Moon and scientists believe that it was created by a giant impact between the young Earth and a Mars-sized body. Some non-science based people prefer to believe that it is an Alien spacecraft.
The Moon, it has been said, is apparently in the wrong orbit for its size and density which can only mean that it is not as heavy as we think, with the obvious conclusion that it is hollow.
Some of these claims come from the fact that when meteors strike the Moon, it rings like a bell. More specifically, when the Apollo crew, on November 20, 1969, released the lunar module, after returning to the orbiter, the module impact with the Moon caused their seismic equipment to register a continuous reverberation like a bell for more than an hour.
The conspiracy theory developed that if the Moon is hollow then it must be an alien spacecraft. The Moon is a hollowed-out planetoid created by unknown beings with technology far superior to any on Earth. Huge machines would have been used to melt rock to form the outer shell we see and large cavities within the Moon where aliens sit and watch us.
Proponents of this theory point to the many asteroids and meteors impact sites on the Moon's surface which are shallow craters with a convex floor instead of concave as expected, supporting the idea of a rigid shell.
Further evidence is that the Earth is aged at 4.6 billion years old, while Moon rocks were dated at 5.3 billion years and the moon’s crust is much harder than originally presumed. When NASA was recorded drilling down a few inches into the Moon’s surface, it appeared that metal shavings were visible.
Also, the Moon is the only natural satellite in the Solar System that has a stationary, near-perfect circular orbit and why is just the absolute perfect distance and size to completely cover the sun during an eclipse?
Over to you Professor Brian Cox.