Rocks from #China's #Moon mission suggest Luna history revision
18 researchers from the Chinese Academy of Sciences, assess #paleointensity – a measure of historical #magneticfield. #Basalt samples thought to be 2.8B years old. Analysis suggests Moon's magnetic field has increased in strength. Moon once possessed a strong "dynamo" – the term for forces that create celestial bodies' magnetic fields – but it weakened around 3.1B years ago and shut down around 1B years ago.
https://www.theregister.com/2024/12/20/chinese_moon_samples_analysis/

Paleointensity (Earth sciences 🌍)

In geomagnetism, paleointensity is the study of changes in the strength of the geomagnetic field over Earth's history. Émile and Odette Thellier were the first to make laboratory measurements to determine the strength of the ancient field responsible for producing remanent magnetization in a rock or archeological artifacts.

https://en.wikipedia.org/wiki/Paleointensity

#Paleointensity #Geomagnetism #EarthSciences #Paleomagnetism