Hollow Moon Rings like a Bell

 
 

55 hand blown glass bells, iron meteorites, monofilament, 2019

The Hollow Moon theory proposes that Earth's Moon is either wholly hollow or otherwise contains a substantial interior space formed after Apollo 12 deliberately crashed the Ascent Stage of its Lunar Module onto the Moon's surface. Astronauts claimed that the Moon “rang like a bell” for 55 minutes, leading to arguments that it must be hollow like a bell. Lunar seismology experiments since then have shown that the lunar body has shallow moonquakes that act differently from quakes on Earth, due to differences in texture, type and density of the planetary strata, but there is no evidence of any large empty space inside the body.