Editing Comet (section)

=== Jets ===
[[File:Hartley2jets2 epoxi big.jpg|thumb|170px|Gas and snow jets of [[103P/Hartley]]]]
Uneven heating can cause newly generated gases to break out of a weak spot on the surface of comet's nucleus, like a geyser.<ref name=jets>{{cite web |url=http://hubblesite.org/hubble_discoveries/comet_ison/blogs/comets-and-jets |title=Comets and Jets |work=Hubblesite.org |date=12 November 2013}}</ref> These streams of gas and dust can cause the nucleus to spin, and even split apart.<ref name=jets/> In 2010 it was revealed that [[Sublimation (phase transition)|sublimation]] of [[dry ice]] (frozen carbon dioxide) can power jets of material flowing out of a comet nucleus.<ref>{{cite news |url=http://www.astronomynow.com/news/n1011/11hartley/ |title=Dry ice fuels comet jets |work=Astronomy Now |first=Emily |last=Baldwin |date=11 November 2010 |archive-url=https://web.archive.org/web/20131217034053/http://www.astronomynow.com/news/n1011/11hartley/ |archive-date=17 December 2013}}</ref> Infrared imaging of Hartley&nbsp;2 shows such jets exiting and carrying with it dust grains into the coma.<ref>{{cite news |url=https://www.nytimes.com/2010/11/19/science/space/19comet.html |archive-url=https://ghostarchive.org/archive/20220101/https://www.nytimes.com/2010/11/19/science/space/19comet.html |archive-date=2022-01-01 |url-access=limited |title=Comet Hartley 2 Is Spewing Ice, NASA Photos Show |work=The New York Times |last1=Chang |first1=Kenneth |date=18 November 2010}}{{cbignore}}</ref>