What is Interstellar cloud?
[[File:Carved by Massive Stars.jpg|thumb|300px|A small part of the [[emission nebula]] [[NGC 6357]]. It glows with the characteristic red of an [[H II region]].<ref>{{cite web |title=Carved by Massive Stars |url=http://www.eso.org/public/images/potw1334a/ |work=ESO Picture of the Week |publisher=[[European Southern Observatory]] |access-date=13 September 2013}}</ref>]] An '''interstellar cloud''' is a denser-than-average part of the [[interstellar medium]], (ISM). It is [[matter]] and [[radiation]] in the [[Interstellar space|space]] between the [[star system]]s in a [[galaxy]]. An interstellar cloud is formed by the gas and dust particles from a [[red giant]] in its later life. The cloud is made of [[gas]], [[plasma (physics)|plasma]], and [[Cosmic dust|dust]] in [[Milky Way|our]] and other [[Galaxy|galaxies]]. Its [[hydrogen]] can be: *neutral, making it an [[H I region]]; *[[ionisation|ionized]], or [[plasma]] making it an [[H II region]]; or *molecular ([[molecular cloud]]s). Neutral and [[Ionization|ionized]] clouds are sometimes also called ''diffuse clouds''. == Sources == {{reflist}} [[Category:Nebulae]] [[Category:Hydrogen]] [[Category:Red giants]]