Editing Europa (moon) (section)

===Internal structure===
It is estimated that Europa has an outer layer of [[water]] around {{Convert|100|km|mi|-0|abbr=on}} thick – a part frozen as its crust and a part as a liquid ocean underneath the ice. Recent [[magnetic field|magnetic-field]] data from the [[Galileo (spacecraft)|''Galileo'']] orbiter showed that Europa has an induced magnetic field through interaction with Jupiter's, which suggests the presence of a subsurface conductive layer.<ref name="Phillips 2014">{{cite journal |title=Europa Clipper Mission Concept |journal=Eos, Transactions American Geophysical Union |date=20 May 2014 |last1=Phillips |first1=Cynthia B. |author1-link=Cynthia B. Phillips|last2=Pappalardo |first2=Robert T. |volume=95 |issue=20 |pages=165–167 |doi=10.1002/2014EO200002 |bibcode = 2014EOSTr..95..165P |doi-access=free }}</ref> This layer is likely to be a salty liquid-water ocean. Portions of the crust are estimated to have undergone a rotation of nearly 80°, nearly flipping over (see [[true polar wander]]), which would be unlikely if the ice were solidly attached to the mantle.<ref name="Cowen2008">{{cite news |first=Ron |last=Cowen |title=A Shifty Moon |url=http://www.sciencenews.org/view/generic/id/32135/title/A_shifty_moon |work=Science News |date=7 June 2008 |access-date=29 May 2008 |archive-date=4 November 2011 |archive-url=https://web.archive.org/web/20111104175610/http://www.sciencenews.org/view/generic/id/32135/title/A_shifty_moon |url-status=live }}</ref> Europa probably contains a [[metal]]lic [[iron]] core.<ref name="Kivelson">{{cite journal |last=Kivelson |first=Margaret G. |author2=Khurana, Krishan K. |author3=Russell, Christopher T. |author4=Volwerk, Martin |author5=Walker, Raymond J. |author6= Zimmer, Christophe |s2cid=44381312 |date=2000 |title=Galileo Magnetometer Measurements: A Stronger Case for a Subsurface Ocean at Europa |journal=[[Science (journal)|Science]] |volume=289 |issue=5483 |pages=1340–1343 |doi=10.1126/science.289.5483.1340 |pmid=10958778 |bibcode = 2000Sci...289.1340K }}</ref><ref name="Bhatia2017">{{cite journal|last1=Bhatia|first1= G.K.|last2=Sahijpal|first2= S.|title=Thermal evolution of trans-Neptunian objects, icy satellites, and minor icy planets in the early solar system |journal=Meteoritics & Planetary Science |doi=10.1111/maps.12952|volume=52|issue= 12|year=2017|pages=2470–2490|bibcode=2017M&PS...52.2470B|s2cid= 133957919|doi-access=free}}</ref>