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 Arthur Briaud of the French National Centre for Scientific Research in France, "question the evolution of the Moon magnetic field thanks to its demonstration of the existence of the inner core and support a global mantle overturn scenario that brings substantial insights on the timeline of th

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