NASA Scientists Find Dynamo at Lunar Core May Have Formed Magnetic Field

https://www.nasa.gov/news/releases/latest/index.html

The moon no longer has a magnetic field, but NASA scientists are publishing new research that shows heat from crystallization of the lunar core may have driven its now-defunct magnetic field some 3 billion years ago.
Source: Solar System News
NASA Scientists Find Dynamo at Lunar Core May Have Formed Magnetic Field
Solar System News