Editing Dynamo theory (section)

===Tidal heating supporting a dynamo===
Tidal forces between celestial orbiting bodies cause friction that heats up their interiors. This is known as tidal heating, and it helps keep the interior in a liquid state. A liquid interior that can conduct electricity is required to produce a dynamo. Saturn's Enceladus and Jupiter's Io have enough tidal heating to liquify their inner cores, but they may not create a dynamo because they cannot conduct electricity.<ref name="Enceladus">{{cite web | url=http://www.nasa.gov/mission_pages/cassini/whycassini/cassini20100708-b.html | title=Saturn's Icy Moon May Keep Oceans Liquid with Wobble | publisher=NASA | date=October 6, 2010 | access-date=August 14, 2012 | author=Steigerwald, Bill | archive-date=March 24, 2015 | archive-url=https://web.archive.org/web/20150324222212/http://www.nasa.gov/mission_pages/cassini/whycassini/cassini20100708-b.html | url-status=dead }}</ref><ref name="Io geologic">{{cite web | url=https://clas.asu.edu/node/12161 | title=Geologic map of Jupiter's moon Io details an otherworldly volcanic surface | publisher=Astrogeology Science Center | date=March 19, 2012 | access-date=August 14, 2012 | author=Cassis, Nikki }}{{dead link|date=September 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> Mercury, despite its small size, has a magnetic field, because it has a conductive liquid core created by its iron composition and friction resulting from its highly elliptical orbit.<ref name="mercury core">{{cite web | url=http://carnegiescience.edu/news/mercury%E2%80%99s_surprising_core_and_landscape_curiosities | title=Mercury's Surprising Core and Landscape Curiosities | publisher=Carnegie Institution for Science | website=MESSENGER | date=March 21, 2012 | access-date=August 14, 2012 | archive-date=January 18, 2015 | archive-url=https://web.archive.org/web/20150118213837/http://carnegiescience.edu/news/mercury%E2%80%99s_surprising_core_and_landscape_curiosities | url-status=dead }}</ref> It is theorized that the Moon once had a magnetic field, based on evidence from magnetized lunar rocks, due to its short-lived closer distance to Earth creating tidal heating.<ref name="lunar dynamo">{{cite web | url=http://news.ucsc.edu/2011/11/lunar-dynamo.html | title=Ancient lunar dynamo may explain magnetized moon rocks | publisher=University of California | date=November 9, 2011 | access-date=August 14, 2012 | author=Stevens, Tim}}</ref> An orbit and rotation of a planet helps provide a liquid core, and supplements kinetic energy that supports a dynamo action.