Presently, the moon does not have an internal magnetic field as it can be observed on Earth. However, there are localized regions on its surface up to several hundred kilometers in size where a very strong magnetic field prevails. This has been shown by measurements on rocks from the Apollo missions. Since then, research has puzzled about the origin of these magnetic spots. One theory is that they are in some way remnants of an ancient core magnetic field. Possibly similar to what can still be observed on Earth today. Here, the core consists of molten and solid iron and its rotation generates the earth’s magnetic field. Why the inner field of the Moon has extinguished at some point remains a subject of research.