Jesse Michels on Apollo Moon Missions: "The Moon is hollow, it rang like a bell" "That big test they did where they bombed the moon and it rang like a bell for a few hours. That's literally a fact." On November 20, 1969, Apollo 12 deliberately crashed its lunar module ascent stage into the Moon. Seismometers recorded vibrations lasting nearly an hour. They repeated it with Apollo 13's rocket stage — it rang for almost four hours. NASA geophysicist Gordon MacDonald later stated the data sugges...