Editing Planetary core (section)

====Mercury====
Mercury has an observed magnetic field, which is believed to be generated within its metallic core.<ref name="Hauck and Van Orman 2011" /> Mercury's core occupies 85% of the planet's radius, making it the largest core relative to the size of the planet in the Solar System; this indicates that much of Mercury's surface may have been lost early in the Solar System's history.<ref name="NASA 2012">{{cite journal |author=NASA |date=2012 |title=MESSENGER Provides New Look at Mercury's Surprising Core and Landscape Curiosities |journal=News Releases |publisher=NASA |location=The Woodlands, Texas |pages=1–2 }}</ref> Mercury has a solid silicate crust and mantle overlying a solid metallic outer core layer, followed by a deeper liquid core layer, and then a possible solid inner core making a third layer.<ref name="NASA 2012" /> The composition of the iron-rich core remains uncertain, but it likely contains nickel, silicon and perhaps sulfur and carbon, plus trace amounts of other elements.<ref>{{cite book | chapter=The Chemical Composition of Mercury | last1=Nittler | first1=Larry R. | last2=Chabot | first2=Nancy L. | last3=Grove | first3=Timothy L. | last4=Peplowski | first4=Patrick N. | title=Mercury: The View after MESSENGER | editor1-first=Sean C. | editor1-last=Solomon | editor2-first=Larry R. | editor2-last=Nittler | editor3-first=Brian J. | editor3-last=Anderson | isbn=9781316650684 | series=Cambridge Planetary Science Book Series | publication-place=Cambridge, UK | publisher=Cambridge University Press | year=2018 | pages=30–51 | doi=10.1017/9781316650684.003  | arxiv=1712.02187 | bibcode=2018mvam.book...30N | s2cid=119021137 }}</ref>