Well, the verdict is in. The Moon is not made of green cheese after all. A thorough investigation published in May 2023 found that the inner core of the Moon is, in fact, a solid ball with a density similar to that of iron. This, researchers hope, will help settle a long debate about whether the Moon's inner heart is solid or molten , and lead to a more accurate understanding of the Moon's history – and, by extension, that of the Solar System. "Our results," wrote a team led by astronomer