Editing Moon (section)

=== Magnetic field ===
The Moon has [[Magnetic field of the Moon|an external magnetic field]] of less than 0.2 [[Tesla (unit)|nanoteslas]],<ref name="Mighani2020">{{cite journal |last1=Mighani |first1=S. |last2=Wang |first2=H. |last3=Shuster |first3=D.L. |last4=Borlina |first4=C.S. |last5=Nichols |first5=C.I.O. |last6=Weiss |first6=B.P. |title=The end of the lunar dynamo |journal=Science Advances |volume=6 |issue=1 |year=2020 |pages=eaax0883 |doi=10.1126/sciadv.aax0883 |pmid=31911941 |pmc=6938704 |bibcode=2020SciA....6..883M}}</ref> or less than one hundred thousandth [[Earth's magnetic field|that of Earth]]. The Moon does not have a global [[dipolar]] magnetic field and only has crustal magnetization likely acquired early in its history when a dynamo was still operating.<ref name="GB2009" /><ref>{{cite web |url=http://lunar.arc.nasa.gov/results/magelres.htm |publisher=[[Lunar Prospector]] (NASA) |title=Magnetometer / Electron Reflectometer Results |date=2001 |access-date=March 17, 2010 |url-status=dead |archive-url=https://web.archive.org/web/20100527121330/http://lunar.arc.nasa.gov/results/magelres.htm |archive-date=May 27, 2010}}</ref> Early in its history, 4 billion years ago, its magnetic field strength was likely close to that of Earth today.<ref name="Mighani2020" /> This early dynamo field apparently expired by about one billion years ago, after the lunar core had crystallized.<ref name="Mighani2020" /> Theoretically, some of the remnant magnetization may originate from transient magnetic fields generated during large impacts through the expansion of plasma clouds. These clouds are generated during large impacts in an ambient magnetic field. This is supported by the location of the largest crustal magnetizations situated near the [[antipodes]] of the giant impact basins.<ref>{{cite journal |last=Hood |first=L.L. |author2=Huang, Z. |title=Formation of magnetic anomalies antipodal to lunar impact basins: Two-dimensional model calculations |journal=[[Journal of Geophysical Research]] |volume=96 |issue=B6 |pages=9837–9846 |date=1991 |doi=10.1029/91JB00308 |bibcode=1991JGR....96.9837H}}</ref>