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Story summary
- Swiss and German researchers identified a dense, magnetized rock formation on the Moon’s far side.
- The formation spans about 60 km wide and 9 km deep.
- It formed roughly 4.2 billion years ago when the Moon’s magnetic field was one-fifth to one-third Earth’s.
- Researchers published the results on September 23 in Science Advances.
- They analyzed data from Lunar Prospector (1998), Kaguya (2007) and GRAIL (2011).