Editing Mare Imbrium (section)

== Origin ==
Mare Imbrium formed when a proto-planet from the asteroid belt collided with the Moon during the [[Late Heavy Bombardment]].<ref>{{Cite journal |last1=Merle |first1=R. E. |last2=Nemchin |first2=A. A. |last3=Grange |first3=M. L. |last4=Whitehouse |first4=M. J. |last5=Pidgeon |first5=R. T. |year=2014 |title=High resolution U-Pb ages of Ca-phosphates in Apollo 14 breccias: Implications for the age of the Imbrium impact |journal=Meteoritics & Planetary Science |volume=49 |issue=12 |pages=2241–2251 |bibcode=2014M&PS...49.2241M |doi=10.1111/maps.12395 |doi-access=free}}</ref> The impact is dated to approximately 3922 ± 12 million years ago, based on [[radiometric dating]] techniques. [[Ejecta]] from the impact covers large areas of the near side of the Moon.<ref>{{Cite journal |last1=Nemchin |first1=Alexander A. |last2=Long |first2=Tao |last3=Jolliff |first3=Bradley L. |last4=Wan |first4=Yusheng |last5=Snape |first5=Joshua F. |last6=Zeigler |first6=Ryan |last7=Grange |first7=Marion L. |last8=Liu |first8=Dunyi |last9=Whitehouse |first9=Martin J. |last10=Timms |first10=Nicholas E. |last11=Jourdan |first11=Fred |date=2021-04-01 |title=Ages of lunar impact breccias: Limits for timing of the Imbrium impact |journal=Geochemistry |language=en |volume=81 |issue=1 |pages=125683 |doi=10.1016/j.chemer.2020.125683 |bibcode=2021ChEG...81l5683N |s2cid=224884243 |issn=0009-2819|doi-access=free |hdl=20.500.11937/90165 |hdl-access=free }}</ref><ref>{{Cite journal |last1=Zhang |first1=Bidong |last2=Lin |first2=Yangting |last3=Moser |first3=Desmond E. |last4=Hao |first4=Jialong |last5=Shieh |first5=Sean R. |last6=Bouvier |first6=Audrey |date=December 2019 |title=Imbrium Age for Zircons in Apollo 17 South Massif Impact Melt Breccia 73155 |url=https://onlinelibrary.wiley.com/doi/abs/10.1029/2019JE005992 |journal=Journal of Geophysical Research: Planets |language=en |volume=124 |issue=12 |pages=3205–3218 |doi=10.1029/2019JE005992 |bibcode=2019JGRE..124.3205Z |s2cid=210277861 |issn=2169-9097}}</ref>