It's not entirely accurate to say that there is absolutely no magnetic field on the Moon. There is a very weak magnetic field present, but it's significantly different from the Earth's magnetic field. Here's why:

* Lack of a molten core: The Earth's magnetic field is generated by the movement of molten iron in its core. This process is called a "geodynamo." The Moon, on the other hand, has a small, solid core. It lacks the churning, molten material necessary to create a strong magnetic field.

* Weak remnant field: While the Moon doesn't have a global magnetic field like Earth, it does have localized magnetic anomalies. These are small areas with a stronger magnetic field than the surrounding region. Scientists believe these anomalies are remnants of a stronger magnetic field that the Moon might have had in its early history, when it was still geologically active.

In essence, the Moon does have a magnetic field, but it's extremely weak and localized compared to the Earth's powerful, global magnetic field. This means the Moon offers very little protection from the harmful radiation of the Sun and solar storms.