Editing Planetary core (section)

===Core merging and impacts===
Impacts between planet-sized bodies in the early Solar System are important aspects in the formation and growth of planets and planetary cores.

====Earth–Moon system====
The [[giant impact hypothesis]] states that an impact between a theoretical Mars-sized planet [[Theia (hypothetical planet)|Theia]] and the early Earth formed the modern Earth and Moon.<ref name="Halliday and N. 2000">{{cite journal |last1=Halliday |last2=N. |first2=Alex |title=Terrestrial accretion rates and the origin of the Moon |journal=Earth and Planetary Science Letters |publisher=Science |volume=176 |issue=1 |date=February 2000 |pages=17–30 |doi=10.1016/s0012-821x(99)00317-9 |bibcode=2000E&PSL.176...17H}}</ref> During this impact the majority of the iron from Theia and the Earth became incorporated into the Earth's core.<ref name="Seti Institute 2012">{{Cite web |date=2012 |title=A new Model for the Origin of the Moon |url=http://www.seti.org/node/1458 |url-status=dead |archive-url=https://web.archive.org/web/20121021013405/http://www.seti.org/node/1458 |archive-date=21 October 2012 |publisher=[[SETI Institute]]}}</ref>

====Mars====
Core merging between the proto-Mars and another differentiated planetoid could have been as fast as 1000 years or as slow as 300,000 years (depending on [[viscosity]] of both cores).<ref name="Monteaux and Arkani-Hamed 2013">{{cite journal |last1=Monteaux |first1=Julien |last2=Arkani-Hamed |first2=Jafar |title=Consequences of giant impacts in early Mars: Core merging and Martian Dynamo evolution |journal=Journal of Geophysical Research: Planets |publisher=AGU Publications |date=November 2013 |pages=84–87 | doi = 10.1002/2013je004587 |bibcode=2014JGRE..119..480M |volume=119|issue=3 |s2cid=41492849 |url=https://hal-clermont-univ.archives-ouvertes.fr/hal-01636075/file/2014.pdf }}</ref>