Rocks from #China's #Moon mission suggest Luna history revision
18 researchers from the Chinese Academy of Sciences, assess #paleointensity β 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" β the term for forces that create celestial bodies' magnetic fields β 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/