Don Wilson's 1975 book, Our Mysterious Spaceship Moon , popularizes the Vasin-Shcherbakov hypothesis, which suggests the Moon is a hollow, artificial alien craft placed in Earth's orbit. Utilizing various alleged anomalies and supposed NASA cover-ups, the work serves as a foundational, though scientifically debated, text for "ancient astronaut" theories. A digital copy of the text is available through the Internet Archive .
Scientists discovered "mascons"—areas of extremely high density—beneath lunar maria (seas) during the Apollo missions. Our-mysterious-spaceship-moon-by-don-wilson-pdf
: Wilson highlights seismic data from the Apollo missions, particularly the famous observation that the Moon "rang like a bell" Don Wilson's 1975 book, Our Mysterious Spaceship Moon