AI: A new study published in May 2023 claims that the Moon's inner core is actually a solid ball with a density similar to that of iron. The results contradict the traditional idea that the lunar core is made of liquid. The findings also challenge the generally accepted theory of how the Moon's magnetic field formed. Scientists hope that new discoveries will help them better understand the history of the Moon and the solar system as a whole.
Huh, never learned that theory. Why would it be liquid, isn't it pretty well known that there's no tectonic activity? What would keep it from solidifying? And if it's solid, I'm back to the question of who thought it was liquid?