Editing Coma (comet) (section)

==Size==
[[File:17P-Holmes Auvergne 2007 11 02.jpg|left|Comet [[17P/Holmes]], 2007/11/02|thumb]]
Comas typically grow in size as comets approach the Sun, and they can be as large as the diameter of Jupiter, even though the density is very low.<ref name=chap14/> About a month after an outburst in October 2007, comet [[17P/Holmes]] briefly had a tenuous dust atmosphere larger than the Sun.<ref name=atmosphere>{{cite web |author-link=David C. Jewitt |last=Jewitt |first=David |date=2007-11-09 |url=http://www2.ess.ucla.edu/~jewitt/holmes.html |title=Comet Holmes Bigger Than The Sun |publisher=Institute for Astronomy at the University of Hawaii |access-date=2007-11-17}}</ref> The [[Great Comet of 1811]] also had a coma roughly the diameter of the Sun.<ref name="primer">{{cite web
  |title=The Comet Primer
  |publisher=Cometography.com
  |author=Gary W. Kronk
  |url=http://cometography.com/educate/comintro.html
  |access-date=2011-04-05|author-link=Gary W. Kronk
 }}</ref> Even though the coma can become quite large, its size can actually decrease about the time it crosses the orbit of [[Mars]] around 1.5&nbsp;[[Astronomical unit|AU]] from the Sun.<ref name="primer"/> At this distance the [[solar wind]] becomes strong enough to blow the gas and dust away from the coma, enlarging the [[Comet tail|tail]].<ref name="primer"/>