Moon's Solid Iron 'Heart' Confirmed by Scientists.
Scientists have confirmed that the moon has a fluid outer core and a solid inner core, similar to Earth's, after more than 50 years of research. The study also found the first evidence of mantle overturn on the moon, which may explain the presence of iron on its surface. Understanding the moon's inner workings can help scientists unravel its geologic mysteries and prepare for new lunar missions this decade.