The study of a rock coming from the Moon in the Apollo 17 mission has revealed that the Moon has never had a magnetic field. At the Massachusetts Institute of Technology, the details of the magnetism of this rock have been unveiled and realized that it has been exposed to a hard magnetic field on two rocks. In fact, they point out that on the Moon there was a stable magnetic field 4,200 million years ago. According to the researchers, the stability of this magnetic field indicates that the nucleus of the Moon was fused and was the origin of the magnetic field.