text:  Well, come on, the Earth is 81 times as massive as the moon, so it's easy to see how the Earth's gravity could trigger moonquakes, but you couldn't turn that around. And I said, come on, now the moon doesn't have a liquid core, it doesn't have moving plates, it doesn't have active volcanoes that we know about, and the Earth has all of those. So if you had a, the Earth is like a growing baby, and the moon is like an old man. If you had this baby and an old man lying on a cot side by side,